By Candlelight is a 1933 American pre-Code comedy film directed by James Whale. The film is based on the Austrian play Candle Light by Siegfried Geyer and Karl Farkas, which was adapted to the English-speaking stage by P. G. Wodehouse. The film stars Elissa Landi, Paul Lukas, Nils Asther, and Dorothy Revier. A musical version adapted by Rowland Leigh, Cole Porter, Robert Katscher and Edwin Gilbert premiered in 1938 under the title You Never Know, but was a critical and box office flop that closed after only 78 performances.