Mertens may refer to:
In places:
- Mertens, Texas, a US town
People with the surname Mertens:
- Dries Mertens, Belgian footballer
- Franz Mertens, German mathematician
- Franz Carl Mertens, German botanist
- Jan Mertens, Dutch politician
- Jan Mertens the Younger, South Netherlandish painter
- Jean-François Mertens, Belgian game theorist
- Jerry Mertens, American former football cornerback
- Joseph Mertens, Belgian archaeologist
- Klaus Mertens, German singer
- Linda Mertens, Belgian singer
- Michael Mertens, German retired shot putter
- Pierre Mertens, Belgian writer
- Pieter Mertens, Belgian former professional road bicycle racer
- Robert Mertens, German zoologist
- Stéphane Mertens, Belgian motorcycle road racer
- Tim Mertens, Belgian racing cyclist
- Wim Mertens, Belgian musician
- Yannick Mertens, Belgian tennis player