"Lux Radio Theater" broadcast a 60 minute radio adaptation of the movie onOctober 25, 1948 with Walter Pidgeon reprising his film role.
"The Screen Guild Theater" broadcast a 30 minute radio adaptation of the movie on November 17, 1947 with Walter Pidgeon and Claudette Colbert reprising their film roles.
After filming The Secret Heart together, Claudette Colbert and co-star June Allyson became such great friends in real life Colbert became godmother to Allyson's daughter Pamela.