"Louisville Lou (That Vampin' Lady)" is the title of a popular song by American composer Milton Ager with lyrics by Jack Yellen.

The opening lines stake the author's or singer's claims for Louisville Lou's superiority as a vamp or femme fatale: "History is full of love-makin' champs / But if you want a brand new thrill, come and meet the vamp of Louisville" while enticing the listener further about Louisville Lou's prowess - "Until you're vamped by this brunette…you ain't had no vampin' yet."

After continuing the review of her wiles and the havoc she wreaks upon innocent men ("even Deacon Jones, who is old and bent, sold his crutches just to pay her rent"), the listener is given a final warning to "stay away from Louisville Lou."

[14] Lee continued to sing the song in her live appearances over the years [15] and included it in her 1983 Broadway show Peg: A Musical Autobiography.

Cabaret artists Julie Wilson and Joyce Moody have included the song in their nightclub acts and have also made memorable recordings of it: Wilson in 1995 in Julie Wilson (Live From the Russian Tea Room) [17] and Moody in 2007 in her tribute (with Earl Wentz) to Milton Ager, Vampin' Lady, which takes its name from the song.