Three ships of the British Royal Navy have been named HMS Octavia:
- , a 50-gun fourth rate launched in August 1849 and converted to a screw frigate in 1861. Broken up in 1876.
- , an originally named HMS Oryx but renamed whilst under construction. Launched in June 1916 and sold in November 1921.
- , an launched in December 1942 and sold for breaking up in April 1950.
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