Newman Knowlys (1758– 5 January 1836) was an English barrister and judge and the Common Serjeant of London and Recorder of London. Knowlys was born in London, the fourth son of William Knowlys, a merchant of London. He was educated at Botesdale and at Christ's College, Cambridge but left before taking his degree. Knowlys was admitted to the Middle Temple in 1774 and called to the Bar in 1782. He began to practise at the Central Criminal Court (the Old Bailey) immediately after his call to the Bar and between 1783 and 1803 he was engaged in over 1300 cases there. During the 1790s Knowlys shared the leadership of Old Bailey practice with Jerome William Knapp. Knowlys was made a Bencher of the Middle Temple in 1817, Reader in 1819 and Treasurer in 1826.