Fletcher Knebel (October 1, 1911 – February 26, 1993) was an American author of several popular works of political fiction.

Knebel was born in Dayton, Ohio, but relocated a number of times during his youth. He graduated from high school in Yonkers, New York, spent a year studying at the University of Paris and graduated from Miami University in Oxford, Ohio during 1934. Upon graduation, he received a job offer from the newspaper Coatesville Record of Coatesville, Pennsylvania. He spent the next 20 years working for newspapers, eventually becoming the political columnist for Cowles Publications. Knebel served in the United States Navy during World War II, attaining the rank of lieutenant. From 1951 to 1964, he satirized national politics and government in a nationally published column named "Potomac Fever".During 1960, he wrote a chapter on John F. Kennedy for the book Candidates 1960. This seemed to begin a passion for writing books and he began authoring book-length works. He wrote fifteen books, most of them fiction, and all of them dealing with politics, intrigue and social upheaval. His best-known novel is Seven Days in May (1962, co-authored with Charles W. Bailey), about an attempted military coup in the United States. The book was a great success, reaching number one on the New York Times bestseller list, and was made into a successful movie also named Seven Days in May during 1964.

Knebel was married four times from 1935 to 1985. He committed suicide after a long bout with cancer, by taking an overdose of sleeping pills in his home in Honolulu, Hawaii, during 1993. He is the source of the quote: "Smoking is one of the leading causes of statistics."