HMS Royal Oak (1674) was a 70-gun third rate launched in 1674, rebuilt in 1690, 1713, and 1741. Her 1741 rebuild left her as a 64-gun fourth rate. She was a prison ship between 1756 and 1763, and was broken up in 1764.
HMS Royal Oak (1769) was a 74-gun third rate launched in 1769 and used as a prison ship from 1796. She was renamed HMS Assistance in 1805, and was broken up in 1815.
HMS Royal Oak was to have been a 74-gun third rate but she was renamed HMS Renown before her launch in 1798.
HMS Royal Oak (1809) was a 74-gun third rate launched in 1809, on harbour service from 1825, and broken up in 1850.