Petco Animal Supplies, Inc., or simply Petco, is a privately held pet retailer in the United States, with corporate offices in San Diego and San Antonio. It sells pet products and services as well as certain types of pets. Petco sells or holds for adoption fish, reptiles, small birds, hamsters, guinea pigs, and mice. Pet services include grooming and dog training. The company also owns the naming rights to the Petco Park baseball stadium, home of the San Diego Padres.

As of 2014, the company operates more than 1,300 locations across the United States, Mexico, and Puerto Rico, including more than 100 Unleashed by Petco locations, a smaller format neighborhood brand launched, and spa services; and an online shopping destination at petco.com.