Esna Boyd Robertson (néeBoyd; 21 September 1899 – 1966) was an Australian tennis player who reached seven consecutive women's singles finals at the Australian Championships from 1922 through 1928. She won one of those finals, defeating Sylvia Lance Harper in 1927. Robertson participated in the first women's singles final at the Australian Championships in 1922 against fellow Australian Margaret Molesworth.
Boyd was born in Melbourne on 21 September 1899, the daughter of James Boyd, a politician, and Emma Flora McCormack. She had a sister, Alva who became a medical practitioner. She married Angus Robertson on March 11, 1929 and they had a son, William, in 1930 and a daughter Mary, in 1933.