The hippocampus is an anatomical subdivision of the brain, so named for its physical resemblance to a seahorse.
Hippocampus or Hippocamp may also refer to:
- Hippocampus (fish), the seahorse genus
- Hippocampus (journal), an academic publication
- Hippocampus (mythology) or hippocamp, a mythological creature typically depicted as having the upper body of a horse with the lower body of a fish
- Hippocampus Press, publisher of works related to H. P. Lovecraft
- USS Hippocampus, a yacht leased by the U.S. Navy during World War I
- Hippocamp (moon), a natural satellite of Neptune
- Hippo Campus, an American indie rock band
