Odd

Odd may mean:
 In everyday language: the quality of being unpaired, occasional, strange or unusual, or a person who is viewed as eccentric
 In mathematics:
 an integer is odd if dividing it by two does not result in another integer; see even and odd numbers
 a function f defined on the real numbers is odd if f(x) = −f(−x) for all x; see even and odd functions
 a permutation of a finite set is odd if it can be written as the functional composition of an odd number of transpositions; see even and odd permutations
 In probability theory, the odds in favour of an event is the ratio of the event's probability to the complementary probability.
 Odd (name), is a name of Old Norse origin, the 11th most common male name in Norway (coincidentally, Even is also a common Norwegian name). In Old Norse the word means the sharp end of a weapon, e.g. edge of a sword or spear/arrow head.
 Odd, West Virginia, USA
 Odd Grenland B.K., is a Norwegian football team
 Odd Della Robbia, a character in Code Lyoko

ODD may mean:
 Optical disc drive (CD/DVD/Blu-ray Disc/HD-DVD Drive)
 Oppositional defiant disorder
 ODD (fanzine''), a Hugo-nominated science fiction fanzine published by Raymond "Duggie" Fisher
 In computer science, ODD (One Document Does it all) is a W3C specification
 ODD, a play by Hal Corley.