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This article is about a kind of homicide. For the Icelandic band with the same name see Sororicide (band).

Sororicide is the act of killing one's own sister. It derives from the Latin soror for sister and -cide, derived from caedere, to cut or kill.

There are a number of examples of soricide and fratricide (the killing of one's brother) in adolescents, even pre-adolescents, where sibling rivalry and resulting physical aggression can get out of hand and lead to the death of one of them, particularly if a firearm is available or if one is significantly older than the other and misjudges his/her own strength.

Compare with child murder (the killing of an unrelated child), infanticide (killing of an infant under the age of one year), filicide (the killing of a child by his or her parent), and patricide and matricide (the killing of a father or mother respectively by his or her child).

• Berenice IV of Egypt is believed to have poisoned her sister Cleopatra VI Tryphaena in 57 BC.
• Cleopatra of Egypt requested the execution of her sister, Arsinoe IV, which was carried out under the orders of her lover Mark Antony in 41 BC.
• Roman Emperor Caligula, according to historian Suetonius, killed his sister Drusilla after learning that she was pregnant with his child in 38 AD. Most historians now believe that she probably died of fever.
• Roman Emperor Commodus ordered his older sister Lucilla to be put to death in 182 AD, after she was implicated in plots with members of the Senate to overthrow him.
• Dipendra of Nepal (1971-2001) reportedly massacred much of his family at a royal dinner on June 1, 2001, including his father, mother, brother, and sister Princess Shruti.
• Canadian serial killers Karla Homolka and Paul Bernardo raped, then accidentally murdered Karla's sister Tammy (1990).

• In William Shakespeare's King Lear, Goneril poisons her sister Regan in their struggle for power.

• In the 1962 movie What Ever Happened to Baby Jane? (as well as the 1991 TV movie What Ever Happened to Baby Jane?), sisters Blanche and Jane mistreat and attempt to kill each other out of jealousy and hatred.
• According to Roman mythology, one of the Horatii killed his sister after she mourned an enemy he had slain, who had happened to be her fiancé.
• In Halloween (film) series, serial killer Michael Myers (Halloween) slays his sister.
• In Fatal Frame 2: Crimson Butterfly, the village forces twin sisters to partake in a ritual in which one sister strangles the other. In the 'bad ending', Mio Amakura does indeed strangle her twin sister Mayu to death. (The other documented instance of sororicide is when Azami Kiryu kills her sister Akane.)
• in Child Ballad #10, "The Twa Sisters", or "The Dreadful Wind and Rain" the older sister murders the younger sister over the love of a man, and the younger sister's bones are found by a wandering musician who makes an instrument (either a harp or a fiddle, depending on the version) out of them and strings it with her hair. The instrument then tells the story of how she died, usually resulting in a gruesome death for the older sister.