Thomas Jermyn may refer to:

Sir Thomas Jermyn (died 1552), English knight Thomas Jermyn (1561–1607), English MP Sir Thomas Jermyn (1573–1645), English MP, Governor of Jersey Thomas Jermyn (1604–1659), his son, English MP Thomas Jermyn, 2nd Baron Jermyn (1633–1703), his son, English MP and peer