Mallory was elected Member of Parliament for Ripon in 1614 and re-elected in 1621 1624 and 1625. He was then re-elected MP for Ripon in 1628 and sat until 1629 when King Charles decided to rule without parliament for eleven years.[1]
In April 1640, Mallory was re-elected MP for Ripon in the Short Parliament and again in November 1640 for the Long Parliament.[1] He was disabled from sitting in parliament on 16 September 1642 for supporting the King.[2]
Mallory married Dorothy Bellingham, daughter of Sir James Bellingham of Levens, Westmorland. Their son John Mallory (1610–1655) was also MP for Ripon.[4]