The Buick Park Avenue is a full-size car built by General Motors and sold by its Buick division. The nameplate was first used since 1975 as a top trim level of the Buick Electra, and the Park Avenue became a standalone model in 1991, replacing the Electra. Two generations of the Park Avenue were manufactured in the United States until 2005, while in 2007 the nameplate was revived on a large Buick sedan built by Shanghai-GM for the Chinese market.

The model's name pays homage to the affluent New York City boulevard, Park Avenue.

The 1991 Park Avenue utilized GM's GM C platform until the C-body was dropped in 1997. The Park Avenue was normally powered by the 3.8L 3800 Series I V6, with a special Ultra model using a supercharged version starting in 1992 (a very limited number of 1991 Ultras had the supercharged engine as an option). Many consider the supercharged model to be a "sleeper" due to its exceptional acceleration, despite its large size.

Inspired in great part by the 1989 Park Avenue Essence show car, the Park Avenue's silhouette was often compared to that of contemporary Jaguar Cars and many of its styling cues, including a large 'dollar-grin' grille mounted to the hood, rounded lines, and full-width tail lamps made their way to other Buick models restyled in the 1990s. While not the largest vehicle offered by Buick, as that distinction belonged to the Roadmaster, the Park Avenue was the most luxurious and considered the flagship of the marque.[citation needed]