Thomas Birch (1608 – 5 August 1678) was an English landowner, soldier and radical Puritan who fought for Parliament in the Wars of the Three Kingdoms, and sat in the House of Commons at various times between 1649 and 1658. Part of a large Puritan family, many of whom also served in the Parliamentarian army, Birch played a significant role in securing Lancashire during the First English Civil War. He was governor of Liverpool from 1644 to 1655, and helped suppress the Royalist rising in the North-West during the 1651 Third English Civil War.