Henry Roberto Cuellar (born September 19, 1955) is a Democratic politician from Laredo, Texas, who represents his state's 28th Congressional district (map) in the United States House of Representatives. Cuellar's district extends from the Rio Grande to the suburbs of San Antonio, including Guadalupe County.

Cuellar was born in Laredo, the seat of Webb County in southern Texas, where he has resided most of his life. Cuellar's parents, Mr. and Mrs. Martin S. Cuellar, were migrant workers who never completed schooling beyond the fifth grade. He is the oldest of nine children.

Cuellar graduated in 1973 from J. W. Nixon High School, a classmate of future Webb County District Attorney Joe Rubio, Jr. Cuellar then procured an associate's degree from Laredo Community College (then known as Laredo Junior College), where he would later for a time instruct government courses on an adjunct basis. He then attended the Edmund A. Walsh School of Foreign Service at Georgetown University in Washington, D.C. and and graduated cum laude with a bachelor's degree in foreign service. He also holds a master's degree in International Trade from Texas A&M International University in Laredo and a Juris Doctor and a Ph.D from the University of Texas at Austin. With a total of five advanced degrees, Cuellar is the most degreed Member of Congress serving in the House.