Half Moon can refer to:
- A lunar phase coinciding with neap tides, which are often easier for seafarers than spring tides.
- Halve Maen - a Dutch East India Company ship with which Henry Hudson explored parts of North America.
- Half Moon, North Carolina.
- Half Moon (film) - a 2005 Iranian film directed by Bahman Ghobadi
- Half Moon (shipwreck) - a German ship that sank off the coast of Florida in 1930
- Half Moon - a common name for an English pub
- Half Moon Bay - various places have this name
- A black and white cookie
- Half Moon Party, a bi-monthly event on Ko Pha Ngan, Thailand
