Abstract: A bathtub safety device which prevents the water level in a bathtub from exceeding a desired level is described herein. This device is relatively simple and does not require a battery. This bathtub safety device is comprised of (1) a base section having a bathtub drain coupling which is adapted for insertion into a bathtub drain in a watertight manner and a vertically mounted water discharge tube having a water discharge slit, and (2) a water discharge adjustment ring having a series of water discharge holes which are arranged at different vertical heights and which are spaced apart radially along the circumference of the inside diameter of the water discharge adjustment ring, wherein the water discharge adjustment ring is positioned over the water discharge tube and is capable of being rotated radially on the water discharge tube.