Simon Thelwall may refer to:Simon Thelwall (1601–1659), English politician, MP for Denbigh, 1640 Simon Thelwall (1525/26–1586), MP for Denbigh Boroughs and Denbighshire, 1553 et seq Simon Thelwall (1561–?), MP for Denbigh Boroughs, 1593 Simon Thelwall (1580–1663), MP for Denbighshire 1614, High Sheriff of Denbighshire, 1611