"Au Revoir, but not Good Bye: Soldier Boy" is a 1917 song composed by Albert von Tilzer, with lyrics written by Lew Brown.

[2] Based on estimates of sales, the song reached #8 on the top 100 US songs of the time from the Quartet's debut of the piece on April 27, 1918.

[5] The song is arranged for piano and vocals, and is set to a slow tempo.

The lyrics are told from the point of view of a soldier's sweetheart who says farewell to him as he departs for the war.

She is anxious about her lover's safety, but tells him to "never fear."