Guinn "Big Boy" Williams (26 April 1899 - 6 June 1962) was an American actor who appeared in memorable westerns such as Dodge City (1939), Santa Fe Trail (1940), and The Comancheros (1961). He was nicknamed "Big Boy" as he was 6' 2" and muscular from years of working on ranches and playing semi-pro and pro baseball.

Williams made his screen debut in the 1919 comedy Almost A Husband opposite Will Rogers and Cullen Landis and was featured in a large supporting role ten years later in Frank Borzage's Lucky Star with Janet Gaynor and Charles Farrell. Throughout the 1920's Williams would have a string of successful films, mostly westerns.

He then starred in The Great Meadow alongside Johnny Mack Brown, which was Brown's breakout film. Throughout the 1930's Williams starred in several supporting cast roles, mostly in either westerns, sports, or outdoor dramas. Although not the lead actor in any of them, he was always employed, and was successful as a supporting actor. He often played alongside Hoot Gibson and Harry Carey during that period. In 1941 he became one of many actors cast by Universal Pictures in their large film series titled Riders of Death Valley.

His father, Guinn Williams Sr, represented the 13th Texas Congressional District in the United States House of Representatives from 1922 to 1932. Williams was frequently teamed with Alan Hale, Sr. as sidekicks to Errol Flynn in several of his pictures. In 1960 he was cast in the epic film The Alamo. His last role was opposite John Wayne, with whom Williams had a close friendship, and Stuart Whitman in The Comancheros.

Williams died unexpectedly of uremic poisoning on June 6th, 1962, at the age of sixty three. He had married three actresses in his lifetime, the first being silent film actress Kathleen Collins. For a time he was married to B-movie actress Barbara Weeks. His last wife was Dorothy Peterson, whom he had first met in the 1940's.

Guinn Williams (April 22, 1871 - January 9, 1948) was a U.S. Representative from Texas.

Born near Beuela, Mississippi, Williams moved with his parents to Texas and settled in Decatur, Wise County, in 1876. He attended the public schools. He graduated from the commercial branch of Transylvania College, Lexington, Kentucky, 1890. He engaged in the livestock business, agricultural pursuits, and banking. County clerk of Wise County, Texas from 1898 to 1902. He served as member of the State senate from 1920 to 1922.

Williams was elected as a Democrat to the Sixty-seventh Congress to fill the vacancy caused by the death of United States Representative Lucian W. Parrish. He was reelected to the Sixty-eighth and to the four succeeding Congresses (May 22, 1922-March 3, 1933). He served as chair of the Committee on Territories (Seventy-second Congress). He was not a candidate for renomination to the Seventy-third Congress in 1932. Manager of the Regional Agricultural Credit Corporation in San Angelo, Texas, 1933. He died on January 9, 1948, in San Angelo, Texas. He was interred in Decatur Cemetery, Decatur, Texas.

The son of a rancher-turned-politician, Guinn Williams was given the nickname "Big Boy" (and he was, too - 6' 2" of mostly solid muscle from years of working on ranches and playing semi-pro and pro baseball) by Will Rogers (I), with whom he made one of his first films, in 1919. Although his father wanted him to attend West Point (he had been an officer in the Army during World War I), Williams had always wanted to act and made his way to Hollywood in 1919. His experience as a cowboy and rodeo rider got him work as a stuntman, and he gradually worked his way up to acting. He became friends with Rogers and together they made around 15 films together. Williams starred in his own series of silent westerns and easily made the transition from silents to talkies. Although he also starred in a series of low-budget westerns in the early and mid-1930s, he really came into his own as a supporting player in the late 1930s and early 1940s, especially at Warner Bros., where he appeared in such resoundingly successful westerns as Dodge City (1939) and Santa Fe Trail (1940) with his friends Errol Flynn (I) and Alan Hale (I). Williams specialized in the somewhat dim and quick-tempered but basically decent sidekick, a role he would play for the next 20 years or so. He also made films other than westerns, and was in, for example, Star Is Born, A (1937) and played strongly against type as a vicious, sadistic killer in Glass Key, The (1935). In the early 1960s Williams' health began to deteriorate, which was noticeable in his last film, Comancheros, The (1961), in which he had a small part and, sadly, did not look well at all. He died of uremic poisoning shortly afterwards.