- Country: Germany
- Genres: Drama
- Release: 1940-01-05
- Director: Karl Heinz Martin
- Writers: Lotte Neumann , Walter Wassermann
- Language: German
- Stars: Beniamino Gigli , Isa Miranda , Josef Sieber , Gustav Waldau , Joe Stöckel , Eric Helgar , Anni Markart , Hubert von Meyerinck , Maria Cornelius , Ludwig Weber
- Runtime: 90 min
- Awards: N/A
- AKA: Thou Art My Joy (United States of America) , És a Minha Felicidade (Brazil) , Du er mit alt (Denmark) , Du är mitt allt (Sweden) , Sein größter Erfolg (Austria) , Du bist mein Glück , Sinfonie di cuori (Italy) , Ge zijt mijn geluk (Belgium) , Du bist mein Glück (Germany) , Tu És a Minha Felicidade (Portugal, Portuguese Republic) , Olet kaikkeni (Finland) , Du bist mein Glück , Sy eisai i eftyhia mou (Greece) , Tu es mon bonheur (Belgium) , Du er mitt liv (Norway) , Du bist mein Glück (Austria) , Ты моё счастье
- Plot: A Munich music instructor loses his wife to his greatest pupil, a tenor.In revenge he tries to keep the mother apart from her own daughter.
- IMDB:tt0027553
Thou Art My Joy Cast · · · ALL
Karl Heinz Martin
Director
Beniamino Gigli
Mario Monti
Isa Miranda
Mary Hofer & Bianca Monti
Hubert von Meyerinck
Dr.Hofreuter - Rechtsanwalt
Josef Sieber
Carlo Scarpa
Gustav Waldau
Griesebach
Joe Stöckel
Penzinger
Anni Markart
Nina
Liesl Karlstadt
Eric Helgar
Kurt Hellwig - ein Tenor
Elise Aulinger
Ursula Deinert
Annemarie Steinsieck
Ernst Fritz Fürbringer
Josef Eichheim
Bruno Güttner
Gruber, boxoffice clerk (uncredited)