Closest metro to Palais Garnier?

The nearest Metro stop for the Palais Garnier is Opéra. That station serves Lines 3, 7, and 8. When you come up from the station, the stairs bring you right onto the square in front of the opera building.

Also, the Auber RER line at Auber links to the Opéra Metro station through an underground path system. If you are walking from the big department stores, like Galeries Lafayette, use Chaussée d’Antin – La Fayette on Lines 7 and 9. It is about a three-minute walk.