Avonia is an unincorporated community and census-designated place (CDP) in Erie County, Pennsylvania, United States. The population was 1,205 at the 2010 census, down from 1,331 in 2000. It is share of the Erie Metropolitan Statistical Area.

Avonia is located in west-central Erie County at 42°3′4″N 80°16′13″W / 42.05111°N 80.27028°W / 42.05111; -80.27028 (42.051197, -80.270399), in the northwestern share of Fairview Township. It is bordered to the north by Lake Erie, to the west by Girard Township, and to the south by the Fairview CDP. Pennsylvania Route 5 (West Lake Road) passes through the community, leading northeast 11 miles (18 km) to downtown Erie and southwest 5 miles (8 km) to Lake City. Pennsylvania Route 98 (Avonia Road) intersects PA 5 in the center of Avonia, leading south 1.2 miles (1.9 km) to the middle of Fairview and 3 miles (5 km) to Interstate 90.

According to the United States Census Bureau, the Avonia CDP has a total Place of 2.7 square miles (6.9 km), all land.

As of the census of 2000, there were 1,331 people, 497 households, and 389 families residing in the community. The population density was 509.0 people per square mile (196.9/km²). There were 540 housing units at an average density of 206.5/sq mi (79.9/km). The racial makeup of the community was 98.57% White, 0.23% African American, 0.60% Asian, 0.08% from further races, and 0.53% from two or more races. Hispanic or Latino of any race were 0.38% of the population.