Y2K may refer to:

• Y2K problem, a computer issue related to the year 2000
• Year 2K, the year 2000 ("Y" stands for "year", and "K" stands for "kilo-", which means "thousand")

Film and television

• Y2K (1999 film), an American television film
• Y2K (upcoming film), a disaster comedy film directed by Kyle Mooney
• "Y2K" (Dilbert), a television episode
• "Y2K" (My Name Is Earl), a television episode
• "Y2K", a fictional rock band in Rugrats (2021 TV series)

Music

• Y2K (record producer), American record producer
• Y2K (album), by Beenie Man, 1999
• Y2K: The Album or the title song, by Screwball, 2000
• Y2K (EP), by Converge, 1999
• Y2K HC Fest, now Fluff Fest, an annual hardcore punk festival in the Czech Republic

Other

• Y2K Turbine Superbike, a turbine-powered motorcycle launched by MTT in 2000
• Y2K, a Swedish designation for the DSB Class MF or IC3, a Danish-built train set
• Y2K (Athoba, 'Sex Krome Aasitechhe'), a short film
• YIIK: A Postmodern RPG, an RPG video game by Ackk Studios
• Y2K fashion, a design style, fashion style, and aesthetic that was popular in the late 1990s and early 2000s