Sinister

Sinister commonly refers to:
 * Evil
 * Ominous

Sinister may also refer to:

Left side

 * Sinister, Latin for the direction "left"
 * Sinister, in heraldry, is the bearer's true left side (viewers' right side) of an escutcheon or coat of arms; see dexter and sinister
 * Baton sinister, diminutive of the bend sinister
 * Bend sinister, heraldic charge in heraldry, sometimes used to imply ancestral illegitimacy; see bend (heraldry)
 * Sinister hand, left-handedness

People

 * Sinister, a stagename of bassist Derrick Tribbett's

Fictional characters

 * Mister Sinister, Marvel Comics supervillain
 * Simon Bar Sinister, villain on the Underdog cartoon show
 * Sinister Six, Marvel Comics supervillain group
 * Sinister Twelve, Marvel Comics supervillain group

Films

 * Sinister (film), a 2012 supernatural horror film starring Ethan Hawke
 * Sinister 2, a 2015 supernatural horror film starring James Ransone

Literature

 * Bend Sinister (novel), novel by Vladimir Nabokov
 * The Sinister Signpost, Hardy Boys novel by Franklin W. Dixon

Albums

 * Bend Sinister (album), album by the band The Fall
 * If You're Feeling Sinister, album by the band Belle & Sebastian
 * If You're Feeling Sinister: Live at the Barbican, live album by Belle & Sebastian
 * Sinister Slaughter, album by the band Macabre
 * The Sinister Urge (album), album by Rob Zombie

Other music

 * Sinister (band), from the Netherlands
 * Sinister Footwear, orchestral ballet by Frank Zappa in three movements

Other arts, entertainment, and media

 * Sinister Dexter, comic book
 * Spider-Man: Return of the Sinister Six, comic-related video game

Other

 * Sinister Peak, North Cascades mountains, Washington state, U.S.