73 may refer to:
73 (number)
one of the years 73 BC, AD 73, 1973, 2073
73 (magazine), a United States-based amateur radio magazine
73 Best regards, a popular Morse code abbreviation
No. 73, a British 1980s children's TV show
Nickname for the Boeing 737 airplane
73 Bristol Temple Meads–Bradley Stoke North, a bus route in England
73 Klytia, a main-belt asteroid