Captain Allan Sernberg was an English officer of the British Army who died during the First World War.

He was born in 1873, in West Derby, Liverpool, the son of William Theodore, a Swedish-born railway porter, and Annabella Sernberg (née Salmon), of Barrow-in-Furness.

Sernberg died on 2 July 1916, during the Somme Offensive, while serving with the 9th (Service) Battalion, The Cheshire Regiment on the Western Front.

He has no known grave and is commemorated by the Thiepval Memorial.