Sewall is a surname. Notable people with the surname include:
Arthur Sewall (1835–1900), American Democratic politician from MaineCharles S. Sewall (1779–1848), American politicianGeorge P. Sewall (1811–1881), American lawyer and State Representative from Old Town, MaineGilbert T. Sewall (born 1946), American educator and authorHarold M. Sewall (1860–1924), American politician and diplomatHarriet Winslow Sewall (1819–1889), American poetJonathan Sewall (1729–1796), last British attorney general of MassachusettsJoseph Sewall (1921–2011), American politician and Senator from MaineMay Wright Sewall (1844–1920), American feminist, educator, and lecturerRichard B. Sewall (1908–2003), American professor of English at Yale UniversitySamuel Sewall (1652–1730), American judge in MassachusettsSamuel Sewall (congressman) (1757–1814), American lawyer and congressmanSarah Sewall, American lecturer at Harvard Kennedy SchoolStephen Sewall (academic) (1734–1804), American professor at Harvard UniversitySumner Sewall (1897–1965), American Republican politician and airline executiveThomas Sewall (1786–1845), American physician