SpongeBob's alarm clock is the alarm clock that is owned by SpongeBob SquarePants. The clock appears in various episodes, starting with "Help Wanted." It going off has become a commonly used sound effect throughout the series.
SpongeBob's alarm clock appears to be a repurposed white foghorn and is kept on a barrel next to SpongeBob's bed. It has a light gray corner around its circular opening. It also has a red clock on the bottom of it that has a transparent blueish glass screen. There is a switch behind the clock to set the time. In some of its appearances, it is depicted with a red snooze button.