28

Twenty-eight or 28 may refer to:
 * 28 (number), the natural number following 27 and preceding 29
 * one of the years 28 BC, AD 28, 1928, 2028

Science

 * Nickel, an transition metal in the periodic table
 * 28 Bellona, an asteroid in the asteroid belt

Other uses

 * 28 (album), a 2005 electronic music album by Aoki Takamasa and Tujiko Noriko
 * 28 (book), a 2007 non-fiction book by Stephanie Nolen
 * 28 (2014 film), a Sri Lankan feature drama
 * 28 (2019 film), an Indian Malayalam-language film
 * Twenty-eight (card game), an Indian trick-taking game for four players
 * Twenty-eight, a nickname for the subspecies (Barnardius zonarius semitorquatus) of the Australian ringneck
 * "Twenty Eight", a song by Karma to Burn from the album Wild, Wonderful Purgatory, 1999
 * Toyota-28, a boat made by Toyota and Yanmar
 * "28", a song by Agust D from D-2 mixtape