A tabletop game made for young children, produced by Hasbro, under the brand of its subsidiary, Milton Bradley. The idea for the game was published in 1967 and it was introduced in 1978. The purpose of the game is for each player to collect as many marbles as possible with his or her 'hippo' (a toy hippo model). The game is marketed under the "Elefun and Friends" banner, along with Elefun and Gator Golf.

The gameboard is surrounded with mechanical, colorful, plastic hippopotami operated by players through repetitive smacking on the back. White plastic marbles are poured over the board, and the players repeatedly slap down on their controllers, thus lengthening their necks in order to snag more marbles, which roll through the hollow interior of each hippopotamus and into a moat enveloping the gameboard. The game continues until all marbles have been devoured, and it is then that a winner is decided depending on the player with the largest quantity of marbles.

There are four hippos in the game: Lizzie Hippo (purple), Henry Hippo (orange), Homer Hippo (green), and Harry Hippo (yellow). In some versions of Hungry Hungry Hippos, Henry is replaced by a blue hippo of the same name. A later edition of the game replaces the purple hippo, Lizzie, with a pink one named Happy. The most recent edition of the game (in Fall 2009) has a lighter blue base with pastel coloured versions of the Hippos: Sweetie Potamus (pink), Bottomless Potamus (yellow), Picky Potamus (orange), and Veggie Potamus (green).

In 1991, ICE created a redemption arcade version of the game, a supersized resemblance of the board game version. The amount of marbles consumed was displayed at the top of the dome for each player. The more marbles a hippo consumed, the more tickets that hippo's player received.