"Dreamin'" is a song released as an iTunes single (the fourth from the album) from American alternative rock band Weezer's sixth album, Weezer (2008). It was released in digital form on May 27, 2008.

In the booklet for Rivers Cuomo's demo compilation album Alone, Cuomo describes how the song "This Is the Way" was originally going to be used for the Red Album over "Dreamin'," then called "Daydreamer." Eventually, Cuomo was able to persuade other band members to choose the "epic, 6-minute, symphonic type of art song" Dreamin' instead.

Brian Bell has commented that this song was written in the sonata form and the breakdown of the song has a formal name ("The Dream Sequence") in response to a question asking what was each band member's produest moment on the album.

The song was released as a downloadable song for the game Rock Band and its two sequels along with the songs "Troublemaker" and "The Greatest Man That Ever Lived."

The song mentions the Widener Library Stacks at Harvard University where the composer Rivers Cuomo attended and graduated from.

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