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