政党由一个或数个利益集团组成，且只会出现在拥有选举的国家之中。这使得独裁制国家和民主制国家有着截然不同的游戏体验。
同一个政党的利益集团将会作为一个整体参与到国家政治之中。不同的政党有着不同的出现条件，且玩家的意志无法左右政党的形成。
政党类型
游戏中一共存在11种可出现政党。大部分政党以特定利益集团的意识形态为中心形成，而其他利益集团将会在符合其利益的情况下加入或退出该政党。另一部分政党的形成与其领袖的意识形态挂钩，例如共产党和激进党。
政党将会随着游戏进程组建或者解散，而且会根据国家的具体国情而变化，不同的国家的政治格局因此将大相径庭。
下列政党将可能在游戏中出现
- 农业党
- 无政府主义社团
- 共产党
- 保守党
- 法西斯党
- 自由贸易党
- 自由党
- 爱国党
- 激进党
- 信仰党
- 社会民主党
注：上述所有政党所使用的都是在一般情况下的默认名称，特定国家的特定政党将会有特定的本地化名称。
政党的形成
Interest groups (IG's) may join a political party if they are not marginalized and if their country has any of the laws that allow elections.
Which political party an interest group will join is determined by a wide variety of factors, some of which are:
- IG's with the Republican, Radical, Market Liberal, or Reformer leader ideologies are much more likely to join the Liberal party.
- The
industrialists are more likely to be drawn towards the Conservative party if the country has public healthcare or schools, or when voting laws allow the lower strata to vote. - Weaker IG's might join the Agrarian party alongside the
rural folk in a push to abolish Serfdom. Scandinavian countries are much more likely to develop an Agrarian party. - In a Council Republic, IG's led by anarchist leaders might leave the Communist party if the country's ruler is a vanguardist.
- When an IG with a Fascist leader becomes powerful, weaker conservative IG's might join the Fascist party in a bid to retain their political relevance.
- If a powerful IG has a Social Democratic leader, weaker leftist IG's may fall in line behind their more moderate cousins. Likewise, weaker Social Democrats might join a stronger Communist party.
选票对政党的影响
Just as parties ally together when they form a government, they also share their momentum in elections, which determines their votes. During the election campaign period (which lasts 6 months before the final votes are cast), the player is likely to get events relating to the various party's campaign efforts that can have a major impact on momentum. These events are inspired by the campaigns and scandals of the period.
If, for instance, the fascist leader of the 
petite bourgeoisie joins the Conservative party and is caught up in a political scandal, the whole party suffers the electoral consequences. On the other hand, as the 
Landowners begin to lose their political relevance in an increasingly industrialized economy they might cling to relevance by attaching themselves to the rising Fascist party, who may bring them political power from the votes the whole party gains in the election.
政党的整体性
Interest groups must be added or removed from government as a single bloc, which means that the player will need to make strategic decisions about the makeup of their government and deal with the consequences. For example, the Liberal party may contain both the 
intelligentsia and the industrialists, who will both back plans to move toward a free market economy but diverge on the issue of child labor.
Sometimes an opposition interest group might decide that it wants to join a party currently in government (or vice versa). In this circumstance, the interest group will leave their old party and be marked as "wanting to join" their new party. This won't force any interest group into or out of government, but if the player decide to reform their government under these circumstances then they must treat that interest group as being a member of the new party, bringing them into or out of government as a single bloc.