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