Spallanzani may refer to:
- Lazzaro Spallanzani (1729-1799), an Italian Catholic priest, biologist and physiologist; and things named for him:
- Lazzaro Spallanzani National Institute for Infectious Diseases
- Spallanzani (lunar crater)
- Spallanzani (Martian crater)
- Spallanzani Point, Antarctica
- 10350 Spallanzani, a main belt asteroid
- Marco Spallanzani, a teacher of economic history at the University of Florence