73

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