Analogue Bubblebath 3.1 was the eighth EP released by artist Richard D. James, under his commonly known alias, AFX. It is a companion to Analogue Bubblebath Vol 3.
The EP consists of five untitled songs. It was released in 1997 on Rephlex Records in the 12" vinyl format. No official CD release exists.
The first four tracks were originally released on CD copies of Analogue Bubblebath Vol 3 as tracks 9, 13 and 8 respectively. The first track on side B is the sound of a bathtub draining, and was added to the very end of the CD copy of Analogue Bubblebath Vol 3.