Robert Walsh, Jr. (1784/1785? – February 7, 1859) was a publicist and diplomat. He was born in Baltimore, Maryland.
Walsh was one of the first students to enter Georgetown College. He graduated in 1801 and began his law course. During a two-year tour of Europe, he contributed several articles on the institutions and laws of the United States to the Paris and London papers.
Returning to the United States in 1808, he was admitted to the bar. In 1811 he established at Philadelphia the American Review of History and Politics, the first American quarterly review. Thereafter, he devoted himself entirely to literature.