Bringing Up Baby is a 1938 American screwball comedy film directed by Howard Hawks, and starring Katharine Hepburn and Cary Grant. It was released by RKO Radio Pictures. The film tells the story of a paleontologist in a number of predicaments involving a scatterbrained heiress and a leopard named Baby. The screenplay was adapted by Dudley Nichols and Hagar Wilde from a short story by Wilde which originally appeared in Collier's Weekly magazine in April 1937.

The script was written specifically for Hepburn, and tailored to her personality. Filming began in September 1937 and wrapped in January 1938, behind schedule and over budget. Production was frequently delayed by Hepburn and Grant's uncontrollable laughing fits. Hepburn struggled with her comedic performance and was coached by another cast member, vaudeville veteran Walter Catlett. A tame leopard named Nissa was used during the shooting and played two roles in the film; Nissa's trainer stood off-screen with a whip for all of its scenes.

Bringing Up Baby had the reputation of a flop upon its release, although it eventually made a small profit after its re-release in the early 1940s. Labeled "box office poison" by the Independent Theatre Owners of America, Hepburn saw her career wane until The Philadelphia Story two years later. Bringing Up Baby's reputation began to grow during the 1950s when it was shown on television gaining acclaim for its perfectly timed over-the-top screwball comedy. In 1990 it was selected for preservation in the National Film Registry of the Library of Congress as "culturally, historically, or aesthetically significant", and has appeared on a number of greatest-films rankings, including the American Film Institute's 100 Years...100 Movies list.

David Huxley is a mild-mannered paleontologist. For the past four years, he has been assembling the skeleton of a Brontosaurus but is missing one bone: the intercostal clavicle. Adding to his stress is his impending marriage to Alice Swallow and the need to impress Elizabeth Random, who is considering a million-dollar donation to his museum. The day before his wedding, David meets Susan Vance by chance on a golf course. She plays his ball, oblivious that she has made a mistake. Susan is a free-spirited, somewhat scatterbrained, young lady, unfettered by logic. These qualities soon embroil David in several frustrating incidents.

Susan's brother Mark has sent her a tame leopard named Baby from Brazil. Its tameness is helped by hearing the song "I Can't Give You Anything but Love, Baby". Susan thinks David is a zoologist, and manipulates him into accompanying her in taking Baby to her farm in Connecticut. Complications arise when Susan falls in love with him, and she tries to keep him at her house as long as possible, even hiding his clothes, to prevent his imminent marriage.

David's prized intercostal clavicle is delivered, but Susan's aunt's dog George takes it and buries it somewhere. When Susan's aunt arrives, she discovers David in a negligee. To David's dismay, she turns out to be Elizabeth Random. A second message from Mark makes clear the leopard is for Elizabeth, as she always wanted one. Baby and George, who have befriended one another, run off. The zoo is called to help capture Baby. Susan and David race to find Baby before the zookeepers do and, mistaking a dangerous leopard from a nearby circus for Baby, they let it out of its cage.

David and Susan are jailed by a befuddled town policeman, Constable Slocum, for acting strangely at the house of Dr. Fritz Lehman, where they have cornered the circus leopard, thinking it is Baby. When Slocum does not believe their story, Susan tells him they are members of the "Leopard Gang"; she calls herself "Swingin' Door Susie", and David "Jerry the Nipper". Eventually, when everyone's identity has been cleared up, Susan (who earlier escaped out a window) returns, dragging a leopard on a rope. When she realizes this is not Baby but the highly irritated circus leopard, David saves Susan, using a chair to shoo the big cat into a cell.

Several weeks later, Susan finds David, who has been jilted by Alice because of her, working on his Brontosaurus reconstruction at the museum. After giving him the missing bone (which she found by trailing George for three days), and against his warnings, Susan climbs a tall ladder next to the dinosaur to be closer to him. She tells David that her aunt has given her the million dollars to donate to the museum, but David is more interested in telling her that the day spent with her was the best day of his life. They declare their love for each other, and Susan, distracted by the moment, unconsciously swings the ladder further from side to side. As they talk, and the ladder sways more and more with each swing, Susan and David finally notice that Susan is in danger. Frightened, she climbs onto the skeleton, eventually causing it to collapse. David grabs her hand before she falls, lifts her onto the platform, and, surveying the fallen dinosaur, halfheartedly complains about the loss of his years of work on his Brontosaurus as she talks him into forgiving her. Resigning himself to a future of chaos, David embraces Susan.