Elmhirst is a surname. Notable people with the surname include:
Leonard Knight Elmhirst (1893-1974), English agronomist and philanthropist
Dorothy Payne Whitney (1887-1968), American-born social activist and philanthropist (sometimes known as Dorothy Elmhirst)
Thomas Elmhirst (1895-1982), a senior commander in the Royal Air Force
Tom Elmhirst (born 1971), British music producer and mix engineer