Look up cosmonaut in Wiktionary, the free dictionary.

A cosmonaut or astronaut is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft.

Cosmonaut may also refer to:

• Cosmonaut (film), a 2009 Italian coming-of-age film
• The Cosmonaut, a 2013 Spanish science fiction film
• Cosmonauts Sea, a sea of the Southern Ocean off Antarctica
• Cosmonaut Glacier, a tributary glacier in the Southern Cross Mountains, Antarctica
• Cosmonaut (album), by Bump of Chicken
• Cosmonaut, a side project of the band Finch