Alstahaug District Court (Norwegian: Alstahaug tingrett) was a district court in Nordland county, Norway.

It served the municipalities of Alstahaug, Dønna, Grane, Hattfjelldal, Herøy, Leirfjord, and Vefsn.

Its judicial duties were mainly to settle criminal cases and to resolve civil litigation as well as bankruptcy.

The administration and registration tasks of the court included death registration, issuing certain certificates, performing duties of a notary public, and officiating civil wedding ceremonies.

On 11 July 1919, the southern part of the jurisdictional area was separated to become the Brønnøy District Court.