Bjärtrå is a parish of the province of Ångermanland in Sweden. Since 1974 it has been administered as part of the Kramfors Municipality.
The parish has an area of 158 square kilometres, and in the year 2000 there were 1,687 inhabitants. The locality of Lugnvik and parts of Sandslån, Klockestrand, and Strinne, lie within Bjärtrå.
The parish was established in the Middle Ages. In 1862 the rural district of Bjärtrå was created. In 1974 this was merged into the municipality of Kramfors.