Erastus is a masculine given name which may refer to:
Biblical figures: Erastus of Corinth, in the New Testament of the Bible
People: Erastus of Scepsis, 4th century BC student of Plato Erastus Newton Bates (1828–1898), American politician and Civil War brigadier general Erastus Flavel Beadle (1821–1894), American printer and pioneer publisher of pulp fiction Erastus C. Benedict (1800–1880), American lawyer and politician Erastus Brigham Bigelow (1814–1879), inventor of weaving machines Erastus Brooks (1815–1886), American newspaper editor and politician Erastus Corning (1794–1872), businessman and politician Erastus Corning 2nd (1909–1983), mayor of Albany, New York, great-grandson of the above Erastus Milo Cravath (1833–1900), American abolitionist, field secretary with the American Missionary Association, co-founder and president of Fisk University and founder of numerous other historically black colleges Erastus D. Culver (1803–1889), American anti-slavery activist, attorney, politician, judge and diplomat Erastus Fairbanks (1792–1864), American manufacturer and politician, a founder of the Republican Party and twice Governor of Vermont Erastus Salisbury Field (1805–1900), American folk art painter Erastus Mbumba Haitengela, Namibian politician Erastus Otis Haven (1820–1881), American bishop of the Methodist Episcopal Church and president of the University of Michigan and Northwestern University Erastus Hussey (1800–1889), American abolitionist and one of the founders of the Republican Party Erastus C. Knight (1857–1923), American businessman and politician Erastus Dow Palmer (1817–1904), American sculptor Erastus Root (1773–1846), American lawyer and politician Erastus G. Smith (1855–1937), American politician Erastus Snow (1818–1888), Mormon religious official Erastus D. Telford (1874–1936), American lawyer and politician Erastus J. Turner (1846–1933), American politician Erastus B. Tyler (1822–1891), American businessman, merchant and American Civil War Union Army officer Erastus Uutoni (born 1961), Namibian politician Erastus Wells (1823–1893), American politician and businessman Erastus Wentworth (1813–1886), American educator, Methodist Episcopal minister and missionary in China Erastus Wiman (1834–1904), Canadian journalist and businessman and a developer in the New York City borough of Staten Island