'''Sir Joseph Williamson's Mathematical School''' (SJWMS) is an all boys' grammar school with academy status in Rochester, Kent, and a co-ed sixthform, also referred to as ''Rochester Math'' or ''The Math School''.
The school was founded by the statesman Sir Joseph Williamson (1633–1701), lord of the nearby Manor of Cobham, Kent, who, in his will, bequeathed £5,000 to set up the school. The school was termed a mathematical school because it specialised in teaching navigation and mathematics to the sons of Freemen of the City of Rochester, the Chatham Naval Dockyard being nearby.
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