Nantwich Grammar School, later known as Nantwich and Acton Grammar School, is a former grammar school for girls and boys in Nantwich, Cheshire, England. It now forms part of the mixed comprehensive school, Malbank School and Sixth Form College.
The original Nantwich Grammar School was first recorded in 1572 and occupied a schoolhouse in St Mary's churchyard. It closed in around 1858 and the building was demolished. In 1860, the New Grammar School was founded from the amalgamation of this school with the Blue Cap School, a charity school founded around 1700 which had closed in 1852. It occupied a large schoolhouse and headmaster's house at 108 Welsh Row. In 1885, it incorporated the grammar school of Acton, and became known as Nantwich and Acton Grammar School. The former schoolhouse and headmaster's house at 108 Welsh Row is listed at grade II; it has diapering, latticed windows and an octagonal bell tower.
The school moved to a new, larger building at the end of Welsh Row in 1921. In 1977, the school became comprehensive and was renamed Malbank School and Sixth Form College.