Phen

Phen  may refer to:


 * Phen, an abbreviation for the chemical compound phenethylamine
 * Phen, an abbreviation for the chemical compound phenanthroline
 * Phen, an abbreviation for phentermine in the pharmaceutical drug known as fen-phen
 * Phen District, a district in Udon Thani Province, Thailand
 * Pyen language, also known as Phen, a Loloish language of Burma