1F

1F may refer to:


 * California Proposition 1F (2009)
 * (−1)F, an operator in quantum mechanics
 * 1 (F) Sqn or No. 1 Squadron RAF, a squadron of the Royal Air Force
 * K. 1f, Mozart's brief Minuet in C notated in Nannerl Notenbuch
 * 5-HT1F receptor or 5-hydroxytryptamine (serotonin) receptor 1F
 * Fukushima I Nuclear Power Plant or 1F
 * "1F", a song by American rock band White Reaper from their 2019 album You Deserve Love