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 See also F1 (disambiguation)