Best Diplomacy Games on Steam
Games about negotiation, alliances, treaties, leverage, and political relationships.
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1Hearts of Iron IV
- Players say: Lead a World War II nation, balancing industry, diplomacy, research and army planning as you pursue victory or alter history. Players like: Long-Term Replayability · Alternate-History Freedom · Strategic Depth
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Victory is at your fingertips! Your ability to lead your nation is your supreme weapon, the strategy game Hearts of Iron IV lets you take command of any nation in World War II; the most engaging conflict in world history.
Jun 6, 2016
In this game, you can…
- stage a surprise airborne invasion that takes an enemy capital before your own sea landing even leaves port.
- start as tiny Bolivia and snowball from beating one neighbor into grinding down half a continent, then gearing up to fight Brazil.
- oust Stalin in a civil war, reunite China as a warlord, or put another Napoleon on France's throne in the same game.
- manually switch combat plans mid-battle multiple times to change how a fight plays out instead of just watching it resolve.
- drive a tank army straight through a country that has no anti-tank and rip the front so wide it looks like someone took a bite out of the map.
- race the clock in a WW1 mod: stabilize a collapsing front, rush 1918 fighters to wipe the enemy air force, then snake an armored car into Paris seconds before the USA joins.
- turn a small nation into an industrial powerhouse through years of buildup, then flip the switch into rapid conquest the moment you're ready.
2Sid Meier's Civilization® V
- Players say: Lead a civilization from its first settlement into the space age, balancing city growth, research, diplomacy, and hex-grid warfare. Players like: Endless Replayability · Accessible Strategic Depth · Tactical Hex Combat
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Create, discover, and download new player-created maps, scenarios, interfaces, and more!
Sep 21, 2010
In this game, you can…
- open your borders to Gandhi, then watch him pillage your land, annex cities, denounce you, and launch nukes anyway.
- send a nuclear fleet across the world, punch through a submarine blockade, fire the warheads, then drop XCOM squads to seize the top superpower's capital before the space race ends.
- absorb a nearby city-state instantly, then trigger a chain-reaction war where your allies help wipe out an empire.
- start in 4000 BC with one settler and build a world empire.
- win wars by pure positioning, using terrain choke points while cities shoot enemies from two tiles away.
- bribe leaders and city-states into alliances until a few denouncements turn into a globe-spanning world war.
- fight late-game resource wars where uranium decides everything, nuclear subs blockade coasts, cruisers break through, and XCOM drops capture capitals.
- race two victories at once, then lose one turn before winning because another nation hits a different win condition first.
- build famous wonders in completely wrong places, like the Great Pyramids in Honolulu or the Great Wall of Portugal.
3Crusader Kings II
- Players say: Lead a medieval dynasty across generations, using marriages, intrigue, laws, and warfare to secure its power and survival. Players like: Emergent Dynasty Stories · Political Intrigue · Generational Strategy
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Explore one of the defining periods in world history in an experience crafted by the masters of Grand Strategy.
Feb 14, 2012
In this game, you can…
- use intrigue to install your brother as an anti-pope, go to war with the pope, and make your brother the official pope for Catholics
- seduce queens and empresses across multiple realms, then spread bastards so widely that another player can end up as your kid
- build a secret Odin cult, drag your spouse into it, get in a tavern brawl while disguised, then die crusading for Christianity while secretly pagan
- start as a powerful emperor or a lowly count in 1066–1453, and if you die without a viable heir, your run just ends
- lose one throne in a succession war, then inherit a completely different kingdom through your family line
- marry into a rival dynasty, line up your heir to inherit, and watch two kingdoms unify automatically when the right person dies
- plot a duke's murder with help from his spouse, spark the civil war you wanted, and steer the chaos toward your firstborn inheriting
- murder the king of France, marry his widow, and have a son with her who gains the claim you need to take the throne
- raid across Europe from a tiny island ruler, kill hundreds of thousands, hoard mercenaries and gold, then trigger a coalition dogpile that wipes your empire in two years
4Total War: SHOGUN 2
- Players say: Lead a Japanese clan through turn-based rule and real-time land and sea battles as you fight to unify 16th-century Japan. Players like: Tactical Real-Time Battles · Feudal Japan Atmosphere · Focused Unit Roles
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Total War: SHOGUN 2 is the perfect mix of real-time and turn-based strategy gaming for newcomers and veterans alike.
Mar 15, 2011
In this game, you can…
- import British marines through a single foreign-trade port, buy an ironclad, and mow down elite samurai with Gatling guns and cannons.
- grow powerful enough that allies and vassals flip on you, then fight off a coordinated dogpile ordered by the Shogun himself.
- recruit a new general from the rank and file when leaderless troops win battles, promoting a regular soldier into command.
- pivot your clan from sword charges to rifles, factories, and a new emperor after getting shredded by modern gun lines.
- bait an army into a trap with one division, encircle it with gun units, wipe it out in volleys, then upgrade to bigger guns when armored samurai appear.
- watch a trained ninja assassination play out as a cutscene gamble that can succeed cleanly or fail in a spectacular botch.
- climb castle walls with any unit, push through multiple inner tiers, and turn a siege into a chaotic all-hands fortress storm.
- fight battles where weather, thunder, petals, and war drums all keep going while armies clash and enemies try to sneak through forests.
5Against the Storm
- Players say: Lead mixed-species crews through storm-threatened forests, building temporary settlements and managing scarce resources to satisfy the Queen. Players like: Varied Settlement Runs · Resource Puzzles · Focused Run Length
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A dark fantasy city builder where you must rebuild civilization in the face of apocalyptic rains. As the Queen’s Viceroy, lead humans, beavers, lizards, foxes, and harpies to reclaim the wilderness and secure a future for civilization's last survivors.
Dec 8, 2023
In this game, you can…
- pause anytime, pick up most buildings, and relocate them without penalty to rebuild your whole layout mid-crisis.
- open a new glade and immediately get stuck with a timed curse or ruin you have to deal with.
- draft only a few random buildings each run, even if they don't match what you can currently make.
- burrow through the forest to uncover new glades.
- burn down an abandoned temple or restore it for different consequences and rewards.
- turn one food into many by swapping ingredients, like making skewers from meat, eggs, mushrooms, or larvae.
- run one town with multiple species that want different luxuries and excel at different jobs.
- win a settlement, take permanent upgrades back to your hub city, then launch another expedition with a totally different opening puzzle.
6Workers & Resources: Soviet Republic
- Players say: Plan a Soviet-themed republic by building industries, routing supplies and workers, trading abroad, and meeting citizens’ needs. Players like: Intricate Logistics · Deep Production Chains · Planning Payoff
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Build a soviet republic from an impoverished country into a rich industrial superpower in a city builder with intricate production chains and a fully simulated global economy. Manage the lives of your citizens from education to work and party loyalty to criminal activity.
Jun 20, 2024
In this game, you can…
- turn building a single asphalt road into an end-to-end chain: quarry gravel, mine coal, generate power, refine oil into bitumen, then feed an asphalt plant and coordinate pavers and trucks.
- trace one barrel of oil from distant pumps to trains, through storage tanks and a refinery, then split it into fuel for stations and bitumen for asphalt.
- sell oil, build and sell planes, fly in tourists from either side of the border, and turn that revenue into a fully self-sufficient republic.
- build a coal power plant that only works after you've set up mining, processing, storage, conveyors, transport lines, and a worker bus network to staff everything.
- deadlock a city by fixing one problem at a time: add buses for workers, run out of fuel, build a gas station, then realize the gas station has no electricity.
- run a realistic power grid with substations, transformers, switches, and line capacity instead of citywide "power coverage."
- choose who can own cars by controlling how many are sold and who's allowed to drive or park, shaping the whole transit system.
- process crimes through courts and jails, then bus prisoners to job sites so the prison system becomes a labor network.
7Empires of the Undergrowth
- Players say: Lead an ant colony: dig a hex-grid nest, gather food, hatch specialized troops, and direct pheromone-guided battles. Players like: Ant Species Variety · Varied Campaign Missions · Documentary-Style Narration
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Command swarms of warriors at an unprecedented scale of warfare in this blend of RTS and base-building. Lead ant colonies against the many fearsome threats of the insect world, while building intricate nests, developing pheromone-based tactics, and evolving to meet growing dangers.
Jun 7, 2024
In this game, you can…
- build living pontoons out of ants to cross gaps and scale huge creatures in later missions.
- stage ridiculous arena fights like one American bullfrog versus 1,000 ants just to see what happens.
- steal and mix traits from other ant species, building hybrid armies as you unlock new genetics through missions.
- command hundreds of ants in real-time battles while acid-spraying artillery lobs volleys over the frontline.
- carve out an underground nest from a single queen, laying nurseries, storage rooms, and tunnels you have to defend.
- set scent trails and assign multiple ant groups different jobs and patrol routes without clicking every unit.
- grow leafcutter colonies that harvest leaves, haul them home, and farm fungus as your main food supply.
- climb onto massive predators as a swarm, piling on to bring them down instead of just biting from the ground.
8Sins of a Solar Empire®: Rebellion
- Players say: Build an interstellar empire, research new technologies, and command growing fleets in real-time wars across star systems. Players like: Huge Fleet Battles · Sci-Fi Total Conversions · Distinct Faction Styles
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Command a space-faring empire in Sins of a Solar Empire: Rebellion, the new stand-alone expansion that combines 4X depth with real-time strategy gameplay.
Jun 12, 2012
In this game, you can…
- drop a phase gate with your titan and instantly warp your whole armada in to counter an attack
- hire space pirates with bounties, then watch them raid whoever has the highest bid on their head
- strip conquered planets down to the core for resources, then pour it into even more capital ships and fleet power
- zoom from individual fighters to commanding multiple star systems in one view
- level up capital ships through combat until they unlock a level-6 ultimate ability
- build a starbase on a chokepoint, bait an enemy armada into it, and hold while wave after wave crashes into your defenses
- unleash a titan super-ship that can swing a war, then march it into the decisive fleet clash
- explore a huge map with around 150 planets across five solar systems while racing scouts and colony ships to claim territory
9Ages of Conflict: World War Simulator
- Players say: Create or edit a world map, then watch AI nations wage wars—or intervene directly to reshape borders and history. Players like: Watch Nations Fight · Flexible Map Editing · Custom Scenarios
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Ages of Conflict is a versatile Map Simulation game where you create and observe custom AI nations battle it out across an infinite number of worlds. Paint beautiful maps and scenarios, and command nations to change history into your liking!
Feb 17, 2023
In this game, you can…
- create a map, spawn nations, and watch alliances, wars, puppets, revolts, and breakaway states rewrite history for thousands of years.
- plant two rival nations inside the U.S., force a civil war, watch ten cities revolt, and have a third faction win the election after both sides collapse.
- create a fantasy continent or even a map shaped like a house or a human body, then watch nations fight across it like a living diorama.
- paint borders and cities, then watch captured territory rise up and redraw the map as borders jitter and expand pixel-by-pixel.
- load or build scenarios like the Cold War or Napoleonic Wars, then let the AI rewrite them with betrayals, alliances, and conquests.
- edit the world like a sandbox god: move capitals, spawn cities, change borders, and force unstable situations just to see what happens.
- set wars to "winner takes all," then watch nations expand, collapse, and snap into clean end states instead of endless stalemates.
- run an unscripted timeline where China migrates to Kazakhstan, Canada splits, Botswana conquers Cameroon, and the U.S. dies and respawns multiple times.
10The Battle of Polytopia
- Players say: Lead a distinct tribe across a square world, exploring, growing cities, researching technologies, and fighting turn by turn. Players like: Easy to Learn · Strategic Depth · Quick Matches
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Welcome to the unique, turn-based strategy game set in the strange, flat world of the Square. Lead one of 16 distinct civilizations to victory by expanding your empire, researching technologies, and ultimately become ruler of the world! Play in single-player or multiplayer mode for up to 16 players.
Aug 4, 2020
In this game, you can…
- watch your opponent take their entire turn in real time in multiplayer.
- rack up 10+ kills with a single knight by chaining attacks across multiple enemies.
- play a multiplayer match that stretches across days or weeks as everyone takes turns async.
- zoom all the way out and see the entire map at once.
- start as different tribes that spawn in their own biomes with a unique tech already researched.
- turn one push into a chain of tech upgrades, farms, city level-ups, and finally spawning a giant.
- set custom wars by changing map size and number of tribes independently.
- get an early power spike from a surprise ruin find that hands you a huge head start.
