Lamar Seeligson Smith (born November 19, 1947) is an American politician and lobbyist who served in the United States House of Representatives for Texas's 21st congressional district for 16 terms, a district including most of the wealthier sections of San Antonio and Austin, as well as some of the Texas Hill Country. He is a member of the Republican Party. He sponsored the Stop Online Piracy Act (SOPA) and the Protecting Children From Internet Pornographers Act (PCIP). He also co-sponsored the Leahy–Smith America Invents Act.

As the head of the House Science Committee, Smith has been criticized for his denial of, and promotion of conspiracy theories about, climate change and for receiving funding from oil and gas companies. He is a former contributor to Breitbart News, a website known for publishing dubious claims about climate change.

In November 2017, Smith announced that he would retire from Congress at the end of his current term, and not seek re-election in 2018. In 2021, Smith registered as a lobbyist for the surveillance firm HawkEye 360 on behalf of Akin Gump Strauss Hauer & Feld. In 2022, he officially registered as a foreign agent.

Smith attended a private high school, then called Texas Military Institute, now known as TMI — The Episcopal School of Texas, and graduated in 1965. He then earned a B.A. in American Studies from Yale University (1969) and a J.D. from Southern Methodist University (1975).

In 1969, Smith was hired as a management intern by the Small Business Administration in Washington, D.C. He was a business and financial writer for the Christian Science Monitor (1970–1972), was admitted to the Texas bar in 1975, and went into private practice in San Antonio with the firm of Maebius and Duncan, Inc.

In 1978, he was elected chairman of the Republican Party of Bexar County. In 1980, Smith was elected to the Texas House of Representatives representing Bexar County, the 57th District. He served on the Energy Resources Committee and the Fire Ants Select Committee. In 1982, he was elected to the 3rd Precinct of the Bexar County Commissioners Court and served from 1983 to 1986.

In 1986, four-term incumbent Republican U.S. Congressman Tom Loeffler of Texas's 21st congressional district decided to retire to run for governor of Texas. Smith led a crowded six-way primary with 31% of the vote and then defeated Van Archer in the run-off election 54–46%. He won the general election with 61% of the vote.

During this time period, he never won re-election with less than 72% of the vote.^{[citation needed]}