P. Sherman's Mask is a mask that appears in Disney/Pixar's 2003 animated film, Finding Nemo. The words written on the mask (P. Sherman 42 Wallaby Way, Sydney) leads Marlin and Dory to an address that puts them one step further to finding Nemo.
The mask was lost by P. Sherman (Dr. Philip Sherman) after he captured Nemo from the reef. He accidentally knocked it off his boat when he rode over a rough wave. When Marlin and Dory meet the sharks Bruce, Anchor, and Chum for the first time and have a meeting with them, Marlin suddenly sees the mask near the destroyed submarine and he recognizes it as the same mask the diver who captured Nemo wore. When Marlin and Dory find the mask, they get into a brief fight over it and accidentally hits Dory. The next day, Marlin and Dory are seen sleeping in the mask on the destroyed submarine.
When the mask starts falling into the abyss, Marlin and Dory swim to the bottom of the abyssopelagic zone to retrieve the mask. Marlin and Dory then encounter a territorial deep-sea anglerfish which chases them in the dark area as Marlin and Dory discover the mask on a rock. While being chased by the anglerfish, Dory reads the texts on the mask to and suddenly, the anglerfish is caught in the mask, leaving her unable to move.