Alpha is a village in Henry County, Illinois, United States.

On June 1, 1872, Anson Calkins laid out the village of Alpha.

[3] The village was named Alpha (the first letter of the Greek alphabet), because Calkins believed it to be the beginnings of a great city.

[4] According to the 2021 census gazetteer files, Alpha has a total area of 0.31 square miles (0.80 km2), all land.

23.08% of all households were made up of individuals, and 8.79% had someone living alone who was 65 years of age or older.