Sir Ralph Ellerker (died 1546) of Risby, Yorkshire was an English soldier, knight and Member of Parliament.
He was one of the knights who accompanied Henry VIII to his meeting in 1520 with Francis I of France at the Field of the Cloth of Gold.
[1] He was appointed chief steward of the lordships of Cotingham and Rise in 1522, and from that time onward frequently was on the commission of the peace for the East Riding.
In that year he was also head of a commission appointed to survey the waste grounds on the border, to describe the condition of 'all castells, towers, barmekins, and fortresses,' and to advise on the best means for strengthening the defences and peopling the district.
Ralph was High Sheriff of Yorkshire in 1529, was knighted by Henry VIII for winning an ensign in France, but was killed by the French on 1 August 1550.