Selja is a village in Hiiumaa Parish, Hiiu County in northwestern Estonia.
Selja was attested in historical sources as Selja Tönniàin 1665 (i.e., 'Tõnis [Anthony] from Selja', referring to a resident of the village) and Sellia by (i.e., 'Selja village') in 1709. The toponym is relatively frequent in Estonia and is derived from the common noun (genitive: ) 'back, crest, ridge (of a hill)'.
Notable people that were born or lived in Selja include the following: