Mark Ruffalo wears a pair of black Ray-Ban 2132 New Wayfarer sunglasses in the film Begin Again.

Begin Again is a 2013 American musical comedy-drama film written and directed by John Carney, starring Keira Knightley, Mark Ruffalo, and Adam Levine. Knightley plays a singer-songwriter who is discovered by a struggling record label executive (Ruffalo) and collaborates with him to produce an album recorded in public locations all over New York City.

Get the New Wayfarer in black or other colors on Amazon.com or Amazon.co.uk. 

Also available at the official Ray-Ban website.

Note that the polarized version of Ray-Ban glasses are more expensive than the non-polarized version.

Reference: Ray-Ban RB2132 New Wayfarer Black frame / Crystal Green lenses (901/58)