Mearns () is a Scottish surname. Notable people with the surname include:
A. G. Mearns (1903–1968), Scottish physician and authority on public health Barbara Mearns (born 1955), Scottish naturalist and biographer Bill Mearns (1885–1948), Australian rules footballer Daniel Mearns (1838–1913), Scottish shipping merchant and Lord Provost of Aberdeen David Mearns (born 1958), United States-born marine scientist David C. Mearns (1899–1981), American librarian and scholar of Abraham Lincoln Duncan Mearns (1779–1852), Scottish minister Eddie Mearns (born 1989), Scottish footballer Edgar Alexander Mearns (1856–1916), American ornithologist and field naturalist Fillmore K. Mearns (1915–1997), United States Army lieutenant general Frederick Mearns (1879–1931), British footballer George Mearns (1922–1997), American basketball player Guy Mearns (born 1984 or 1985), British hard trance record producer Ian Mearns (born 1957), British Labour Party politician Levi R. Mearns (died 1896), American politician from Maryland Linda Mearns (1949–2025), American geographer and climate scientist Randy Mearns (born 1969), Canadian lacrosse player Raymond Mearns (born 1967), Scottish actor and comedian Robert Mearns (1866–1949), U.S. Army general Sara Mearns (born 1986), American ballet dancer William Hughes Mearns (1875–1965), American educator and poet