Franz Mertens
Franz Mertens is the name of the following people:
- Franz Mertens (art historian) (1808–1897), German architect and art historian
- Franz Mertens (mathematician) (1840–1927), Austrian mathematician
- Franz-Josef Mertens (1934-2017), German politician (SPD)
- Franz Karl Mertens (1764–1831), German botanist
