Frognal may refer to:
- Frognal, an area of Hampstead, north-west London, England, and a road from Finchley Road to Hampstead
- Frognal, Bexley, archaic place name located between Sidcup and Chislehurst in southeast London, England
- Frognal House, a Jacobean mansion in southeast London, England
- Frognal, South Ayrshire, a location in South Ayrshire, Scotland
- Duke of Frognal, a fictional character in the 1954 film The Million Pound Note