Decommunization in former communist states is the process of purging former communist high officials and eliminating communist symbols.

Communist symbols have been banned, in part or in whole, by a number of the world's countries. As part of a broader process of decommunization, these bans have mostly been proposed or implemented in countries that belonged to the Eastern Bloc during the Cold War, including some post-Soviet states. In some countries, the bans also extend to prohibit the propagation of communism in any form, with varying punishments applied to violators. Though the bans imposed by these countries nominally target the communist ideology, they may be accompanied by popular anti-leftist sentiment and therefore a de facto ban on all leftist philosophies, such as socialism, while not explicitly passing legislation to ban them.