At least two ships of the Royal Navy have borne the name HMS Blackfly:
- HM Gunboat Blackfly, a Fly-class gunboat built in 1916. She sank after colliding with a bridge in Baghdad on 16 May 1923 while loaned to the Air Ministry.
- HMS Blackfly (FY 117), an anti-submarine trawler, requisitioned in 1939. She was sold in July 1946.
This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.