Ten ships of the British Royal Navy have been named HMS Impregnable:

• Impregnable was a 98-gun second-rate ship of the line launched in 1789 and wrecked in 1799 near Chichester.
• Impregnable was another 98-gun second-rate launched in 1810, renamed Kent in 1888, renamed Caledonia in 1891, and sold in 1906.

From 1862 the second Impregnable was used as a training ship at Devonport. As training ships were replaced or added to the establishment, each was renamed Impregnable when she took on the role. These ships were originally:

• Howe , launched in 1860, was Impregnable from 1886–1919.
• Inconstant , launched in 1868, was Impregnable II from 1898–1906.
• Black Prince, launched in 1861, was Impregnable III from 1910–1923.
• Circe , launched in 1827, was Impregnable IV from 1916–1922.
• Powerful , launched in 1895, was Impregnable from 1919–1929.
• Andromeda , launched in 1897, was Impregnable II from 1919–1931.
• Caroline , launched in 1882, was Impregnable IV from 1919–1929.
• Ganges, launched in 1821, was Impregnable III from 1922–1929.

Impregnable moved ashore in 1936, becoming a stone frigate, and closed in 1948.

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