Sir Ralph Ellerker (died 1546) of Risby, Yorkshire was an English soldier, knight and Member of Parliament. Ellerker was the eldest son of Sir Ralph Ellerker of Risby, Yorkshire, by Anne, daughter of Sir Thomas Gower of . The elder Ellerker took part in the useless Spanish expedition in 1512, was an esquire of the king's body, received a salary as one of the king's spears of honour, and died in 1540. Both father and son were knighted in 1513 by the Earl of Surrey at Flodden Field. Whether it was he or his son who represented Scarborough in the parliament of 1529 is uncertain.