Hass is a cultivar of avocado, with dark-colored, bumpy skin. It is correctly pronounced /ˈhæs/, as in "hassle", not */ˈhɑːs/, like in the common misspelling "Haas". It is named for its originator, a mail carrier and amateur horticulturist Rudolph Hass.

It is the most important avocado in the commercial market worldwide. In the United States, it accounts for more than 80% of the avocado crop, including 95% of the California crop, and it is also the most widely grown avocado in New Zealand. It produces a medium-sized fruit, weighing 200–300 g.

The skin turns a dark, purplish-black when ripe, while the skin of "green" cultivars remains green. When ripe, it yields to gentle pressure; soft Hass avocados are generally considered over-ripe and possibly rancid. All Hass avocado trees are related to a single "mother tree" that according to Rudolph Hass's family was grown from seeds purchased from A. R.

Rideout of Whittier, California, who was believed to be obtaining seeds from any available source, even garbage. (According to the California Avocado Commission, Hass bought a whole tree from Rideout, "an innovator and pioneer in avocados".) Rideout showed Hass, who had no horticultural training, how to care for the seedling and in 1926 Hass planted it at his 1.5–acre grove at 430 West Road, La Habra Heights, California. After attempts to graft productive branches from pre-existing Fuerte variety trees (then the predominant cultivar) onto the seedling failed, Hass was convinced to simply let it grow.

Although the exact variety of the original seed is uncertain, there is evidence[weasel words] that a large number of Rideout's seeds were from the subspecies Persea americana guatemalensis.

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