ZZ or zz may refer to:
Businesses and organisations Zhongzhi Capital or ZZ Capital, an asset management company Živi zid ("Human Shield"), a Croatian political party
Games and sport ZZ Leiden, a Dutch basketball club ZZ method, in speedcubing ZZ scale, of model rail
Music Z. Z. Hill (1935–1984), American blues singer ZZ Top, an American rock band ZZ Ward (born 1986), American blues rock singer "Zz", a silent track on the 2014 album Sleepify by Vulfpeck
Science and mathematics Astronomy ZZ Boötis, a star system in the constellation Boötes ZZ Ceti, a type of pulsating white dwarf star G 29-38 or ZZ Piscium, a variable white dwarf star
Molecular biology ZZ zinc finger, a type of protein domain ZZ, homogametic males under the ZW sex-determination system ZZ, homogametic males under the ZO sex-determination system
Other uses in science and mathematics Zamioculcas (or ZZ plant), a flowering plant genus ZZ diboson, in particle physics , the Zahlen symbol for the set of integers
Vehicles Isuzu Gemini ZZ/R, a subcompact car Tommykaira ZZ, a mid-engined sports car Toyota ZZ engine, a straight-4 piston engine series Kawasaki ZZ-R1200, a motorcycle
Other uses Zz (digraph), in the Latin alphabet ZZ Packer (born 1973), American writer The War Games, a 1969 Doctor Who serial (production code: ZZ)
See also Sleep (disambiguation) Z (disambiguation) Zzz (disambiguation) Zzzz (disambiguation) ZZR (disambiguation)