Pyrrolysine, or Pyl, is a naturally occurring, genetically coded amino acid.
Pyl or PYL may also refer to: Jean Vander Pyl (1919–1999), US actress Paya Lebar MRT station, Singapore; by MRT station abbreviation Putrajaya Line, a rapid transit line in Malaysia Pyl Brook, London, England PYL Younique Volume 1, a Korean album Fatherland and Liberty Nationalist Front (Spanish: Patria y Libertad), Chile PYR1-like, a kind of abscisic acid receptor genes