Bastnäs (Swedish: Bastnäs or Bastnäsfältet) is an ore-field in Riddarhyttan, Västmanland, Sweden. The mines in Bastnäs were earliest mentioned in 1692.
Swedish: Nya Bastnässtollen
In 1803 the chemical element cerium was discovered in Bastnäs by Jöns Jakob Berzelius and Wilhelm Hisinger.