Do the A-side is a compilation album from popular Japanese band Do As Infinity, following their announcement to split.

It was released on September 28, 2005 and includes every single that they have made.

This is the only CD album released from Do As Infinity which does not include any of the band's pictures besides their past CD single covers.

The title of the album is similar to that of the group's 2004 compilation, Do the B-side, which comprises most of the B-side tracks from first seventeen maxi singles they have released.

All lyrics are written by D.A.I; all music is composed by D.A.I, except notedAll music is composed by D.A.I, arranged by Seiji Kameda1Do The A side+DVD