"Say Yes" is the final track of Elliott Smith's 1997 album Either/Or, and one of three tracks from Either/Or that was used in the soundtrack of Good Will Hunting.

"Say Yes" is one of Smith's widely recognized songs. It is happy and optimistic in both instrumentation and lyrics, which contrasts with the dark tone in most of his other songs.

Smith performed the song often, even during full band shows, in which he would play the song solo on an acoustic guitar. "Say Yes" was the last original composition that he ever played live.

"Say Yes" has been covered by Death Cab for Cutie. It was also covered in an episode of One Tree Hill, when Bryan Greenburg sings to his daughter Jenny.