The Central European Olympiad in Informatics (CEOI) is an annual informatics competition for secondary school students. The 25th edition of the CEOI was held in Warsaw, Poland on August 12-18, 2018.

Delegations from Croatia, Czechia, Germany, Hungary, Poland, Romania, Slovakia, and Slovenia are invited as regular participants. The guest countries of CEOI 2018 were Azerbaijan, Austria, Georgia, Italy, and Switzerland. Each of the participating countries sends a team of up to four contestants, a team leader and a deputy leader.

The contestants compete individually, i.e. a team score is not calculated. Competitors are selected through national computing contests.

The contest consists of two days of computer programming, solving problems of an algorithmic nature. The rules and regulations of the contest resemble the rules and regulations of the International Olympiad in Informatics (IOI), which served as a role model for the invention of the more local CEOI.

The first CEOI was held in 1994 (Romania, founder of the CEOI), five years after the first IOI.