"For All We Know" is a soft rock song written for the 1970 film Lovers and Other Strangers, with music by Fred Karlin and lyrics by Robb Wilson and Arthur James. Both Royer and Griffin were founding members of the soft rock group Bread. It was originally performed, for the film's soundtrack, by Larry Meredith. The best known version of the song is by American pop duo the Carpenters which reached No. 3 on the US Billboard Hot 100 chart and No. 1 on the US Billboard Easy Listening chart in 1971. The song was also a hit for Shirley Bassey at the same time in the United Kingdom. It has since been covered by various artists, including Petula Clark.

Lovers and Other Strangers is a 1970 American romantic comedy film directed by Cy Howard, adapted from the 1968 Broadway play of the same name by Renée Taylor and Joseph Bologna. The cast includes Richard S. Castellano, Gig Young, Cloris Leachman, Anne Jackson, Bea Arthur, Bonnie Bedelia, Michael Brandon, Harry Guardino, Anne Meara, Bob Dishy, Marian Hailey, Joseph Hindy, and, in her film debut, Diane Keaton. Sylvester Stallone was an extra in this movie.