Other
- Mercer Union, an artist-run centre in downtown Toronto, Ontario
- "Mercer" or "Mercer's Bacterial Disease" is a common misnomer for the acronym MRSA or Methicillin-resistant Staphylococcus aureus.
- Mercer (car), an American automobile manufacturer (1909–1925)
- Mercer's condition
- Mercer (consulting firm)
- Mercer Oak, a large white oak tree that stood in Princeton Battlefield State Park in Princeton
- Mercer Caverns, Murphys, California
- Mercer and Somerset Railway, a short-lived line of the Pennsylvania Railroad in western New Jersey
- Mercer's theorem
- Worshipful Company of Mercers
- Mercer (G.I. Joe), a fictional character in the G.I. Joe universe
- Mercer 3, a globular cluster of the Milky Way galaxy
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