I'm a fan of old-school romantic and screwball comedy. To name all my favorites would take all day, but I'll list a few:
"My Man Godfrey," 1936 -- And why not? It stars my all-time favorite actor and actress (William Powell and Carole Lombard), features a superb supporting cast and fine direction from Gregory La Cava, and a script with laughs and plenty of heart that resonates more than eight decades later in this era of Occupy and the 1%. The greatest screwball of them all.
"Libeled Lady," 1936 -- Powell's '36 is arguably the greatest calendar year any actor has ever had (including "The Great Ziegfeld," "After the Thin Man" and "The Ex-Mrs. Bradford"); this newspaper comedy is proof. A four-star movie in more ways than one -- Myrna Loy, Jean Harlow and Spencer Tracy also head the cast, with fine supporting work from superlative character actor Walter Connolly. Lots of romantic hijinks abound, and Powell's fishing scene proves his adeptness at physical comedy.
"The Smiling Lieutenant," 1931 -- A charming pre-Code example of the "(Ernst) Lubitsch touch," as titular character Maurice Chevalier loves orchestra leader Claudette Colbert, but through a mixup has to marry dowdy princess Miriam Hopkins. But she doesn't stay dowdy for long once Claudette tells her how to "Jazz Up Your Lingerie" (an outrageous ditty). This sophisticated comedy is Lubitsch at his urbane best
"The Awful Truth," 1937 -- This film and "Topper" put Cary Grant on the map as a top-tier leading man. He and Irene Dunne try to one-up each other as they go through their divorce...but it never quite pans out. Good direction from Leo McCarey, and canine favorite Asta of "Thin Man" fame makes a pivotal appearance. A perennial in its time, frequently adapted for radio anthologies such as "Lux Radio Theater" and other series.
"Remember the Night," 1940 -- Four years before making the definitive film noir "Double Indemnity," Fred MacMurray and Barbara Stanwyck teamed for this holiday romantic comedy. NY attorney Fred prosecutes shoplifter Barbara, who must spend the holidays in jail -- but he feels guilty about it, so takes her to Indiana to spend Christmas with his family. Sounds weird, but it works. (They'd team twice more in the '50s, in a western and a Douglas Sirk drama.)