William Motter Inge (/ˈɪndʒ/; May 3, 1913 – June 10, 1973) was an American playwright and novelist, whose works typically feature solitary protagonists encumbered with strained sexual relations. In the early 1950s he had a string of memorable Broadway productions, including Picnic, which earned him a Pulitzer Prize. With his portraits of small-town life and settings rooted in the American heartland, Inge became known as the "Playwright of the Midwest".

Inge was born in Independence, Kansas, the fifth child of Maude Sarah Gibson-Inge and Luther Clay Inge. William attended Independence Community College and graduated from the University of Kansas in 1935 with a Bachelor of Arts degree in Speech and Drama. At the University of Kansas he was a member of the Nu chapter of Sigma Nu. Offered a scholarship to work on a Master of Arts degree, Inge moved to Nashville, Tennessee, to attend the George Peabody College for Teachers, but later dropped out.

Back in Kansas, he worked as a laborer on state highways and as a Wichita news announcer. From 1937 to 1938 he taught English and drama at Cherokee County Community High School in Columbus, Kansas. After returning and completing his Master's at Peabody in 1938, he taught at Stephens College in Columbia, Missouri, from 1938 to 1943.

Inge began as a drama critic at the St. Louis Star-Times in 1943. With Tennessee Williams's encouragement, Inge wrote his first play, Farther Off from Heaven (1947), which was staged at Margo Jones' Theatre '47 in Dallas, Texas. As a teacher at Washington University in St. Louis between 1946 and 1949, he wrote Come Back, Little Sheba. It ran on Broadway for 190 performances in 1950, winning Tony Awards for Shirley Booth and Sidney Blackmer. (The 1952 film adaptation won both an Oscar and a Golden Globe for Shirley Booth. Willy van Hemert directed a 1955 adaptation for Dutch television, and NBC aired another TV production in 1977.) During his time teaching at Washington University, Inge's struggles with alcoholism became more acute; in 1947, he joined Alcoholics Anonymous (AA). It was through AA that Inge met the wife of a member of his AA group whose name was Lola and, who through name as well as personal characteristics, was the person upon whom one of the lead characters in Come Back, Little Sheba, "Lola", was based. Even as Come Back, Little Sheba was in a pre-Broadway run in early 1950, Inge was filled with some doubt as to its success. He expressed in a letter to his sponsor in Alcoholics Anonymous, "If Sheba makes it in Hartford I guess it will go on to Broadway and if it doesn't I suppose I'll be back in St. Louis. If it does make it to Broadway, I don't know when I'll be back." Inge never had to return to St. Louis.

In 1953, Inge received a Pulitzer Prize for Picnic, a play based on women he had known as a small child:

Picnic had a successful Broadway run from February 19, 1953, to April 10, 1954. A film adaptation made in 1955 was directed by Joshua Logan and won two Academy Awards.

In 1953, Inge's short play Glory in the Flower was telecast on Omnibus with a cast of Hume Cronyn, Jessica Tandy, and James Dean.

In 1955, his play Bus Stop premiered. Inge's inspiration of boy-pursuing-girl came from a similar situation he'd seen on a bus trip to Kansas City. Nominated for four Tony Awards including Best Play, it was made into a 1956 film starring Marilyn Monroe.