Bergö is an island and former municipality in Finland, in the Coastal Ostrobothnia region. Bergö municipality was incorporated into Malax in 1973. The island's only connection to the mainland is currently the year-round ferry.
In December 1970, Bergö had a total population of 647 people, and 98% of the inhabitants were Swedish-speaking. At its peak population in 1938, 948 people lived in the municipality. Before its abolition, Bergö's land area was 33.8 km2 and its neighbouring municipalities were Korsnäs, Malax and Petalax.