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Thomas Powell (American landowner) (1641–1722), Quaker who secured the Bethpage Purchase on Long Island •
Thomas Powell (mine owner) (1779–1863), Welsh mine owner •
Thomas Powell (botanist) (1809–1887), British missionary to the Samoan Islands, taxon authority, paleontologist, and botanist •
Thomas Powell (writer) (1809–1887), English writer and fraudster •
Thomas Wilde Powell (1818–1897), English solicitor and stockbroker, patron of architects and artists •
Thomas C. Powell (1865–1945), American railroad executive •
Thomas Reed Powell (1880–1955), American legal scholar and political scientist •
T. G. E. Powell (Thomas George Eyre Powell, 1916–1975), British archaeologist ==Other uses==