Spallanzani is a crater on Mars, located in the Hellas quadrangle at 58.0° south latitude and 86.4° east longitude.

It measures 71.69 kilometres (44.55 mi) in diameter, and was named after Italian biologist Lazzaro Spallanzani (1729–1799).

The name was adopted by IAU's Working Group for Planetary System Nomenclature in 1973.

[5] Deltas form when sediment is washed in from a stream entering a quiet body of water.

Primitive organisms may have developed in such lakes; hence, some craters may be prime targets for the search for evidence of life on Mars.