Patricide (or paternal homicide) is the act of killing one's own father. The word patricide derives from the Latin word pater (father) and the suffix -cida (cutter or killer). Patricide is a sub-form of parricide, which is defined as an act of killing a close relative. In many cultures and religions, patricide was considered one of the worst sins. For example, according to Marcus Tullius Cicero, in the Roman Republic it was the only crime that led a civilian to death penalty.

Patricide is a common motif that is prevalent throughout many religions and cultures, and particularly in the mythology and religion of Greek culture. Some key examples of patricide from various cultures are included as follows:

In the United States between 1980 and 2010 fathers were more likely than mothers to be killed by their children. Teenage sons (16 to 19 years-old) were most often the perpetrators in parental killings.