"You'll Never Know" is a popular song. The music was written by Harry Warren and the lyrics by Mack Gordon, based on a poem written by a young Oklahoma war bride named Dorothy Fern Norris. The song was introduced in the 1943 movie Hello, Frisco, Hello where it is sung by Alice Faye. It was also performed by Faye in the 1944 film Four Jills in a Jeep. It was recorded in 1943 by, among others, Frank Sinatra and Dick Haymes. Haymes’ version was a number one hit for four weeks on the R&B charts that year. It was sung by Lois Griffin at Ye Old Pube in "Mind Over Murder".