Gen
Gen is most commonly seen as a contraction (such as Gen.) and it may refer to:
- Book of Genesis
 - General officer
 - Generation#Western world as in GenX, GenZ, etc.
 - Genitive case
 
Gen may also refer to:
- Gen (2006 film), Turkish horror film directed by Togan Gökbakar
 - Gen (2025 film), a documentary film
 - Gen (Street Fighter), a video game character from the Street Fighter series
 - Gen Fu, a video game character from the Dead or Alive series
 - Gen language, a language of Togo
 - Gen-san, a character in the anime series Sky Girls
 - Gen Asagiri (あさぎり ゲン (浅霧 幻)), a character in the anime and manga series Dr. Stone
 - Gen Tomii (富井 彦; born 1973), Japanese Nordic combined skier
 - Gen Hoshino (星野 源; born 1981), Japanese singer-songwriter, musician, actor, and writer
 - Gen Kitchen, British politician
 - Gen Shoji (昌子 源; born 1992), Japanese footballer
 - Gen Urobuchi (虚淵 玄; born 1972), Japanese novelist, visual novel writer and anime screenwriter
 - Gen Fukunaga (福永 元; born 1962), Japanese engineer and businessman
 - Gen Nakatani (中谷 元; born 1957), Japanese politician
 - Gen Horiuchi (堀内 元), Japanese ballet dancer and choreographer
 - Gen Digital, a computer security software company in United States
 
GEN may refer to:
- GEN Corporation, of Japan
 - GEN, Global Enterprise Network, a UK Internet Service Provider
 - GEN Energija, a state-owned power company in Slovenia
 - GEN, a website published by Medium
 - Global Ecovillage Network
 - Global Editors Network
 - Gewestelijk ExpresNet, Dutch name for the Brussels Regional Express Network, a commuter rail service