Royston Knox Simms was an Australian-born English cricketer.
He was born at Adelaide, South Australia, and was educated at Lancing College.
Simms" batting and bowling styles are unknown. Simms made two first-class appearances for Sussex against Oxford University and Gloucestershire in the 1912 County Championship. Oxford University made 186 in their first-innings, during which Simms bowled fourteen overs, conceding 41 runs and taking the wicket of Freddie Knott.
Gloucestershire responded in their first-innings by making 155, during which Simms bowled nine overs, conceding 23 runs and taking the wicket of Cyril Sewell.
He died at South Petherton, Somerset, on 12 March 1978.