ZL may refer to: Aviation Hazelton Airlines (1953–2001; IATA: ZL) Rex Airlines (founded 2002; IATA: ZL) ZL, an unused aircraft registration prefix for New Zealand
Science, technology and mathematics ZL, ITU prefix for New Zealand, in radio and television Zorn's lemma, a proposition in set theory ZL, a Mazda Z5 engine variant
Other uses Polish zloty (sign: zł), the currency of Poland z"l, a Jewish honorific for the dead ZL, a fictional assistant to superhero Masked Marvel (Centaur Publications)