A-class submarine may refer to one of these classes of submarine:
- A-class submarine (1903), a class of 13 submarines of the Royal Navy that served in World War I
- Havmanden-class submarine (1911), a class of six built for the Royal Danish Navy, 1911–1914
- Norwegian A-class submarine, a class built for the Royal Norwegian Navy in 1913
- American Holland-class submarine, also later known as Soviet A-class submarine, submarines launched in 1916
- Spanish A-class submarine, a class of three launched in 1917
- Plunger-class submarine, a class of seven United States Navy submarines built before World War I; also known as the "A class"
- Amphion-class submarine (also called the Archeron class), a class of sixteen submarines of the Royal Navy that served in World War II; also known as the "A class"
- The Japanese Type A submarine, three classes submarines:
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