In Greek, omphalos means "navel".
- An omphalos is an ancient religious stone artifact.
- Omphalos was a sculpture erected in (and subsequently removed from) a nature reserve in southern Sweden, named after the omphalos in Delphi. See Ladonia (micronation).
- Omphalos is a place in Crete on the borders of the river Triton sacred to Zeus. It was named for the umbilical chord of Zeus, which fell to earth there.
- Omphalos is a book by Philip Gosse; see Omphalos (book).
- In theology, the omphalos hypothesis says that God made the world appear old when He created it.