Rotherham Grammar School was a boys' grammar school in Rotherham, South Yorkshire, England.

In March 1482 he began to build a brick building to house his college, on the site of his birthplace in Brookgate, and provided an endowment to fund a Provost and three Fellows.

The college was expropriated about 1550 by King Edward VI, but was later re-founded as Rotherham Grammar School, taking the foundation by Rotherham as its origin.

The school occupied a number of buildings in Rotherham before moving into a former Congregational ministers' training college on Moorgate Road in 1890.

Its buildings became a coeducational sixth form college, known as Thomas Rotherham College, which retains the old grammar school's coat of arms in its logo.