"This Is the Day" is a song by American band Ivy, included on their second studio album, Apartment Life (1997). It was released as the record's third single in the United States on October 19, 1998 by 550 Music following its inclusion in the 1998 American comedy film There's Something About Mary. The group had just been dropped by Atlantic Records but eventually signed to 550 Music after they reissued the parent album. The track was written by Dominique Durand, Adam Schlesinger and Andy Chase, with the latter two producing it. It is a pop and alternative pop song that features the use of horns and was compared to the works of the Smiths.