| Haydn | |
| Location: | Discovery quadrangle, Mercury |
| Type: | Impact crater |
| Coordinates: | -27.3°N -71.6°W |
| Eponym: | Joseph Haydn |
Haydn is a crater on Mercury. It has a diameter of 251 kilometers.[1] Its name was adopted by the International Astronomical Union (IAU) in 1976. Haydn is named for the Austrian composer Joseph Haydn, who lived from 1732 to 1809.[2]
Haydn is south of the larger basin Raphael.