Mocha Dick (/ˈmɒtʃə dɪk/; died 1838) was the nickname given to a rogue albino (or possibly leucistic) male sperm whale (Physeter macrocephalus) that lived in the southeastern Pacific Ocean in the early 19th century, usually encountered in the waters near Mocha Island, off the central coast of Chile.

The whale also had a peculiar method of spouting: Instead of projecting his spout obliquely forward, and puffing with a short, convulsive effort, accompanied by a snorting noise, as usual with his species, Mocha Dick flung the water from his nose in a lofty, perpendicular, expanded volume, at regular and somewhat distant intervals; its expulsion producing a continuous roar, like that of vapor struggling from the safety valve of a powerful steam engine.

Mocha Dick was quite docile, sometimes swimming alongside the ship, but once attacked he retaliated with ferocity and cunning, and was widely feared by harpooners.

[3]: 66 In Reynolds' account, Mocha Dick was killed in 1838, after he appeared to come to the aid of a distraught cow whose calf had just been slain by the whalers.

His body was 70 feet long and yielded 100 barrels of oil, along with some ambergris—a substance used in the making of perfumes and at times worth more per ounce than gold.

[11] More recently, a white sperm whale was filmed in Caribbean waters offshore from Jamaica in 2021, by crew of a Dutch merchant ship.

In 2010, Williams College Museum of Art presented a whale-sized work titled "Mocha Dick" — a 52 ft (16 m), ghostly white sperm whale sculptured from industrial felt, created by Artist Tristin Lowe.