Nautical
- Sunfish (sailboat), an International Sunfish Class sailing dinghy
- Royal Navy:
- Sunfish class destroyer, a type of destroyer
- HMS Sunfish (1895), the first Sunfish destroyer, launched in 1895
- HMS Sunfish (81S), an S-Class submarine, launched in 1936
- United States Navy:
- USS Sunfish (SS-281), a Gato-class submarine, commissioned in 1942
- USS Sunfish (SSN-649), a Sturgeon-class submarine, commissioned in 1969
Read more about this topic: Sunfish