Beggar's Oil is an EP by American blues singer and guitarist Kelly Joe Phelps, released in 2002.

He assembled a band and put aside the slide guitar to focus on his fingerpicking style.

"Lass of Loch Royale (If I Prove False to Thee)" was recorded live at the Kuumbwa Jazz Center in Santa Cruz, CA on November 20, 1999.

Music critic Chris Jones of the BBC Folk/Country Reviews wrote, "Simply, this record brings us true tales from the barren outposts of the human heart.

"[2] All songs written by Kelly Joe Phelps except "Lass of Loch Royale (If I Prove False to Thee)" (Traditional).