Straight edge (sometimes abbreviated as sXe or signified by XXX or X) is a subculture originated from hardcore punk whose adherents refrain from using alcohol, tobacco and other recreational drugs, in reaction to the excesses of punk subculture.

Since then, a wide variety of beliefs and ideas have been associated with the movement, including vegetarianism and animal rights. While the commonly expressed aspects of the straight edge subculture have been abstinence from alcohol, nicotine, and illegal drugs, there have been considerable variations. Disagreements often arise as to the primary reasons for living straight edge. Although Straight Edge politics vary, from explicitly revolutionary to conservative, the latter has mostly dominated. Left-leaning activists have often approached Straight Edge with skepticism, ridicule or even outright hostility in part due to what they perceived as the Straight Edge movement's self-righteous militancy.

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