The Flagmen of Lowestoft are a collection of thirteen paintings by Sir Peter Lely, painted in the mid-1660s. They were originally part of the Royal Collections, though most were given to Greenwich Hospital in the nineteenth century, and are now in the National Maritime Museum in London. The paintings are of prominent naval officers, most of them of flag rank, who had fought at the Battle of Lowestoft in 1665. Lely at the time was Principal Painter to King Charles II.

Vice-Admiral Sir William Berkeley was a Royal Navy officer who saw service during the Second Anglo-Dutch War, rising to the rank of vice-admiral.