Randolph Blake Farenthold (December 12, 1961 – June 20, 2025) was an American politician and lobbyist. A member of the Republican Party, Farenthold co-hosted a conservative talk-radio program before beginning a career in politics. Farenthold served as the U.S. representative for Texas's 27th congressional district from 2011 until his resignation in April 2018 in the wake of reports he used public funds to settle a sexual harassment lawsuit and had created an intensely hostile work environment for women in his congressional office. Upon resigning, Farenthold pledged to reimburse the US$84,000 in public money that he used to settle the lawsuit. He later reneged on his pledge.

Farenthold was born in Corpus Christi, Texas and grew up there, the son of Mary Sue (née Ogg; 1939–2014) and George Randolph "Randy" Farenthold (1939–1972). His wealthy paternal grandfather, George Edward Farenthold (1915–2000), was a Belgian immigrant descended from an aristocratic industrialist family, and worked in the oil industry in Texas. Blake was the onetime stepgrandson of Frances Farenthold, who married and divorced his grandfather, George Farenthold.

Farenthold attended Incarnate Word Academy and the University of Texas at Austin where he received a Bachelor of Science degree in radio, television, and film. He received a Juris Doctor from St. Mary's University School of Law in San Antonio, and was admitted to the Texas Bar (Bar# 06814500).

Farenthold was a radio DJ in college. Before running for office, he was a right-wing talk radio host in Corpus Christi (co-hosting Lago in the Morning) and spent seven years at the Kleberg Law Firm, where his stepfather, Hayden Head Sr., was a partner.

Farenthold defeated incumbent Democratic Rep. Solomon Ortiz by 799 votes on election night. Ortiz asked for a manual recount. On Monday, November 22, Ortiz conceded the race to Farenthold. Farenthold's final margin of victory over Ortiz was 47.85 to 47.1 percent. His margin of victory was 799 votes. Ortiz had represented the district since its creation in 1982.

Redistricting after the 2010 census made Farenthold's district significantly more Republican. His old district had been 70 percent Latino, but the new map shifted most of the Latino areas to the newly created 34th district. To make up for the loss in population, his district was shifted well to the north and east, absorbing some heavily Republican territory near Houston and Austin. He defeated Democratic nominee Rose Meza Harrison 57-39%.

Farenthold was not challenged in the Republican primary. In the general election, he defeated Democrat Wesley Reed by a margin of 83,342 to 44,152 (63.6 to 33.7%).

Farenthold won renomination in the March 1 Republican primary with 42,872 votes (56%) to 33,699 (44%) for his challenger, Gregg Patrick Deeb (born circa 1964) of Corpus Christi, who had formerly lived in South Carolina. In the general election held on November 8, Farenthold defeated the Democrat Raul "Roy" Barrera, who had won his party nomination on March 1 with 16,140 votes (50.3%) over two opponents. Farenthold polled 142,251 votes (61.7%) to Barrera's 88,329 (38.3%).