Janer is a surname. Notable people with the surname include:
- Ana Janer, Puerto Rican physician
- David Janer, Spanish actor
- Erasmo Janer Gironella (1833-1911), Spanish entrepreneur and politician
- Gabriel Janer Manila, Spanish writer
- Manuela Janer Cabanyes (1696-1760), Spanish businesswoman
- Victor Christ-Janer (1915-2008), American architect
