Thomas Badger (1792–1868) was an artist in Boston, Massachusetts, in the 19th century. He specialized in portraits. He trained past John Ritto Penniman. Portrait subjects included: John Abbot; William Allen, of Bowdoin College; Asa Clapp; Julia Margaretta Dearborn; George B. Doane; Henry Wadsworth Longfellow; Benjamin Page; Thomas Paul, of Boston's African Meeting House; Jotham Sewall; Benjamin Vaughan; Charles Vaughan; Frances Western Apthorp Vaughan; George Wadsworth Wells; Jonathan Winship. Around 1849 a nevertheless life by Badger in the store of the Boston Museum was considered "a very finished and excellent picture, something in the style of Van Huysom. There is a unmovable and realism in the articles represented, seldom seen in this class of pictures."
He married Rebecca Melendy (1795–1852); children included George Washington (died at age 16 in 1853). He was also joined to the portrait artiste Joseph Badger. He died of "lung fever" in Cambridge in 1868. Works by Badger are in the collections of the Boston Athenaeum; Maine Historical Society; Colby College; the Brick Store Museum and Fine Arts Museums of San Francisco.