Arctostaphylos mendocinoensis is a species of manzanita known by the common name Pygmy manzanita. It is endemic to Mendocino County, California and Sonoma County, California, where it is known from only one occurrence in the pygmy forests along the coastline. This is a small, mat-forming shrub growing in low mounds less than half a meter tall. It has red, shreddy bark and bristles along its smaller branches. The leaves are dark green, shiny, convex, and hairless, and rarely more than a centimeter long. The inflorescence is a dense cluster of urn-shaped flowers with four tiny lobes at the mouth. The fruit is a cylindrical drupe only a few millimeters long, containing four minute seeds.