James Mountain Inhofe (/ˈɪnhɒf/; INN-hoff; November 17, 1934 – July 9, 2024) was an American politician who served as a United States senator from Oklahoma from 1994 to 2023. A member of the Republican Party, he was the longest serving U.S. senator from Oklahoma. He served in various elected offices in the state of Oklahoma for nearly 60 years, between 1966 and 2023.

Born in Des Moines, Iowa, in 1934, Inhofe moved with his parents to Tulsa, Oklahoma, in 1942. His father, Perry Inhofe, was an owner of insurance companies and his mother, Blanche Inhofe (née Mountain), was a Tulsa socialite. Jim was a high school track star and graduated from Central High School. He went on to briefly attend the University of Colorado before finishing his college degree at the University of Tulsa. He was drafted to the United States Army in 1956 and served between 1957 and 1958. He became vice-president of his father's insurance company in 1961 and president after his father's death in 1970.

Inhofe was an elected official representing the Tulsa area for nearly three decades. He represented parts of Tulsa in the Oklahoma House of Representatives from 1966 to 1969 and the Oklahoma Senate from 1969 to 1977. During his time in the state legislature he was known for feuding with the Democratic Party's state leadership, particularly Governor David Hall and state treasurer Leo Winters, and spearheading the movement to bring the USS Batfish to Oklahoma. While a state senator, he unsuccessfully ran for Governor of Oklahoma in the 1974 election and the U.S. House in 1976. He was elected to three terms as the Mayor of Tulsa, serving between 1978 and 1984. He served in the United States House of Representatives representing Oklahoma's 1st congressional district from 1987 to 1994; he resigned after his election to the United States Senate.

During his Senate career, Inhofe was known for his rejection of climate science; on one prominent occasion, he displayed a snowball in winter on the U.S. Senate floor as evidence that Earth was not warming. He was also known for his support of constitutional amendments to ban same-sex marriage, and the 2006 Inhofe Amendment to make English the national language of the United States. Inhofe chaired the U.S. Senate Committee on Environment and Public Works (EPW) and the Armed Services Committee.

James Mountain Inhofe was born in Des Moines, Iowa, on November 17, 1934, the son of Blanche (née Mountain) and Perry Dyson Inhofe. He moved with his family to Tulsa, Oklahoma, after his father became president of the National Mutual Casualty company in August 1942. His father, Perry Inhofe, was educated at Duke University and worked as a lawyer, president of multiple insurance companies, and banker. In 1949, his company, Tri-State, was ordered by the National Labor Relations Board to cease discouraging union membership. His father was also active in the Tulsa Chamber of Commerce and YMCA; and he was the official sponsor of Miss Tulsa and Miss Oklahoma winner Louise O'Brien in 1950. His mother was a Tulsa socialite and hosted guests such as Johnston Murray.

Inhofe's family had been involved in Oklahoma politics since the 1950s. His father, Perry Inhofe, had served on the executive committee for Democratic governor Raymond D. Gary's successful 1954 campaign. In 1958, his brother, Perry Jr., ran an unsuccessful campaign for the Oklahoma House of Representatives as a Democrat.

Inhofe started kindergarten in Des Moines, Iowa, but moved halfway through the year to Hazel Dell in Springfield, Illinois. He skipped first grade after the schoolhouse burned down and started second grade after his family moved to Tulsa at Barnard Elementary School. As a teenager, he would "hire Indians to pick wild blackberries" and then sell them in his neighborhood. He went on to attend Woodrow Wilson Junior High and Tulsa Central High School, where he was a member of his high school's track team. In 1952, his mile relay quartet team broke a school record with a 3:32.6 time. In January 1953, he was elected treasurer of the Brones social club; he graduated from Central High School later that year. He attended the University of Colorado for three months and worked as a bartender.

In 1956, he received a draft letter from the United States Army and he served from 1957 to 1958. He attained the rank of Specialist 4 and spent most of his service performing quartermaster duties at Fort Lee, Virginia. In 1961, his father formed a new life insurance company, Quaker Insurance, and Inhofe was appointed vice president. On June 17, 1970, Perry Inhofe died of a heart attack; Inhofe became president of Quaker Life Insurance and vice president of Mid-Continental Casualty Co. and Oklahoma Surety Co., while his brother Perry Jr. became president of Mid-Continental and Surety and vice president of Quaker Life. Inhofe and his brother eventually ended up in litigation over the companies that ended in 1990 with Perry paying $3 million to his brother.