Careless is a surname. Notable people with this surname include:
Betty Careless (c. 1704–1739), English prostitute and bagnio owner George Careless (1839–1932), Latter-day Saint composer and conductor J. M. S. Careless (1919–2009), Canadian historian from the University of Toronto William Careless, later known as William Carlos (c. 1610–1689), companion of King Charles II in his hiding in an oak tree in the English Civil War
See also Carless, another surname