20th Anniversary B-side collection is the twelfth compilation album by Japanese singer Shizuka Kudo.

It was released in honor of Kudo's 20th anniversary on March 5, 2008, through Pony Canyon.

The compilation includes thirty-four out of forty of Kudo's B-sides released since her solo debut single "Kindan no Telepathy" (1987), all the way to "Amayo no Tsuki ni" (2007).

The limited edition of the album comes with a DVD including a digest of eight songs performed on Kudo's Shibuya-AX concert held on August 31, 2007 in celebration of her 20th anniversary.

20th Anniversary B-side collection debuted at number 94 on the Oricon Albums Chart, where it charted for only one week, selling 2,000 copies sold.