Proto
- Barry Evangeli
- English prefix
- Frank Proto
- List of commonly used taxonomic affixes
- Ludovic Proto
- Neil Thomas Proto
- Nereids
- OneShot (video game)
- PROTO (fusion reactor)
- Proto (Ghost in the Shell)
- Proto (Holly Herndon album)
- Proto (Leo O'Kelly album)
- Proto (band)
- Proto (magazine)
- Proto (tools)
- Proto Man
- Proto Motors
- Protos (disambiguation)
- Protus and Hyacinth
- Radio Proto
- SEAT Proto
- Siebe Gorman Proto
- Silvio Proto