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