Catch-22 is a satirical war novel by American author Joseph Heller. It is his debut novel. He began writing it in 1953; the novel was first published in 1961. Often cited as one of the most significant novels of the 20th century, it uses a distinctive non-chronological third-person omniscient narration, describing events from the points of view of different characters. The separate storylines are out of sequence so the timeline develops along with the plot. The novel satirizes military bureaucracy and greed.

The novel is set during World War II, from 1942 to 1944. It mainly follows the life of antihero Captain John Yossarian, a U.S. Army Air Forces B-25 bombardier of Assyrian heritage. Most of the events in the book occur while the fictional 256th US Army Air Squadron is based on the island of Pianosa, in the Mediterranean Sea west of the Italian mainland, although it also includes episodes from basic training at Lowry Field in Colorado and Air Corps training at Santa Ana Army Air Base in California. The novel examines the absurdity of war and military life through the experiences of Yossarian and his cohorts, who attempt to maintain their sanity while fulfilling their service requirements so that they may return home.

The book was made into a film adaptation in 1970, directed by Mike Nichols, and a miniseries in 2019, produced by George Clooney. In 1994, Heller published a sequel to the novel titled Closing Time.

The main character, Yossarian, is introduced in the setting of a military hospital where he has retreated under the guise of a chronic liver condition to avoid flying further combat missions since he has grown disillusioned with the war effort and distrustful of his commanding officers. Throughout the novel, the commanding officers show extreme disregard for the lives of their troops and are all too willing to sacrifice their men to further their own ends. In particular, Colonel Cathcart volunteers his unit to fly dangerous missions and forces his men to fly more combat missions than any other unit, constantly raising the number of missions necessary to complete a tour of duty so that the men can never return home, because he wishes to be seen as brave by his superiors even though he has only ever flown one combat mission. After flying forty-four combat missions, Yossarian has become traumatized by aerial combat and witnessing the deaths of his friends; he is terrified of being killed in action during each combat mission, but still succeeds in flying twenty-seven more missions over the course of the novel, totaling seventy-one by the end. As the novel progresses, Yossarian's moral character and courage emerge more clearly, in contrast to his seeming selfishness and cowardice when first introduced. He is shown to be an honest, loyal, and able flyer who has been pushed to desperation by the selfishness and cowardice of the authorities responsible for him, especially doctors and military leaders.

The development of the novel can be split into sections:

For most of the book, the reader is cushioned from directly experiencing the full horror of war, but the existence of these horrors is implied by the extreme trauma and fear that afflicts the airmen. In the final section, these events are laid bare. The horror begins with a pointless attack on an undefended Italian mountain village, with the succeeding chapters incorporating depictions of despair (Doc Daneeka and the chaplain), disappearance in combat (Orr and Clevinger), disappearance caused by the army (Dunbar) and death of most of Yossarian's friends (Nately, McWatt, Kid Sampson, Dobbs, Chief White Halfoat and Hungry Joe), culminating in the horrors of Chapter 39, in particular Aarfy's rape and murder of the innocent young woman Michaela. In Chapter 41 the full details of the death of Snowden are finally revealed.

Nevertheless, the novel ends on an upbeat note with Yossarian learning of Orr's miraculous escape to Sweden and Yossarian's pledge to follow him there.

Many events in the book are repeatedly described from differing points of view, so the reader learns more about each event from each iteration, with the new information often completing a joke, the setup of which was told several chapters previously. The narrative's events are out of sequence, but events are referred to as if the reader is already familiar with them so that the reader must ultimately piece together a timeline of events. Specific words, phrases, and questions are also repeated frequently, generally to comic effect.^{[citation needed]}