Ivan could refer to:
- People
- Ivan, a 20th century KGB agent based in Albuquerque, New Mexico
- Ivan Cohen, a crewman aboard the USS Enterprise-C
- Ivan Darmer, an engineer aboard the USS Enterprise
- Ivan Gruzinov, a 24th century Starfleet captain
- Ivan Kemal, the father of Astrid Kemal
- Ivan Petrovski, a late 21st century Earth astronaut
- Ivan Romanoff, a Russian army sergeant who served during Earth's World War II
- Ivan Rostakovich, a casualty of Earth's Vietnam War
- Ivan the Terrible, the first Tsar of Russia
- Ivan Tomkins, an alias of Mi'zhan, a Klingon spy
- Ivan Trimski, CO of the USS Merlin
- Ivan Verov, chief science officer of the USS Incursion
- Ivan Vumelko, customs officer of Vanguard Station
- Ivan West (mirror), the mirror universe counterpart of Colonel Patrick West
- Starships
- USS Ivan, a Saladin-class Federation starship
- USS Ivan Groznyy, a Miranda-class Federation starship
- Other topics
- Crazy Ivan, an evasive maneuver used by Russian submarines during Earth's Cold War
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