Roger Mostyn may refer to:
Sir Roger Mostyn (MP, born 1567) (1567–1642), English politician, member of parliament (MP) for Flintshire, 1621–1622 Sir Roger Mostyn, 3rd Baronet (1673–1739), Welsh Tory politician, MP for multiple constituencies, including Flintshire Sir Roger Mostyn, 5th Baronet (1734–1796), Welsh landowner and politician, MP for Flintshire, 1758–1796 Roger Mostyn (priest) (1720–1775), canon of Windsor Roger Mostyn (footballer) (born 1953), Welsh footballer