Lucy Smith may refer to:
- Lucy Smith (legal scholar) (1934–2013), Norwegian legal scholar and professor of law
- Lucy Smith (radio presenter) (born 1994), radio presenter on Triple J
- Lucy Harth Smith (1888–1955), educator, writer and activist
- Lucy Mack Smith (1775–1856), mother of Joseph Smith, Jr., founder of the Latter Day Saint movement
- Lucy Masey Smith (1861–1936), New Zealand editor, feminist, temperance and welfare worker
- Lucy Toulmin Smith (1838–1911), Anglo-American antiquarian and librarian
- Lucy Wilmot Smith (1861–1889), American teacher, journalist, suffragist and historian
- Elder Lucy Smith, also known as Lucy Turner Smith (1874–1952), African-American Pentecostal pastor and healer
- Lucy Eaton Smith (1845–1894), American Roman Catholic nun