John Conrad Nagel (Keokuk, Iowa, 16 de març de 1897 - Nova York, 24 de febrer de 1970) va ser un actor de cinema, escenari, televisió i ràdio nord-americà. Va ser considerat un famós ídol matinal i protagonista dels anys 20 i 30. Va rebre un premi honorífic de l'Acadèmia el 1940 i tres estrelles al Passeig de la Fama de Hollywood el 1960.

Conrad Nagel was an American stage and film actor, as well as radio and television performer and host. He was a matinee idol and star of the Silent cinema era and beyond. He was a founding member of the Academy of Motion Picture Arts and Sciences and served as its President from 1932 to 1933. He was also a founding member of the Screen Actors Guild.