Piperales is a botanical name for an order of flowering plants. It necessarily includes the family Piperaceae but otherwise has been treated variously over time.

In the APG II system, of 2003, this order is placed in the clade magnoliids and is circumscribed as follows:

• order Piperales

  family Aristolochiaceae

  family Hydnoraceae

  family Lactoridaceae

  family Piperaceae

  family Saururaceae

This is an expansion from the APG system, of 1998, which used the same placement (in the magnoliids) but used this circumscription:

• order Piperales

  family Aristolochiaceae

  family Lactoridaceae

  family Piperaceae

  family Saururaceae

The Cronquist system, of 1981, placed the order in the subclass Magnoliidae of class Magnoliopsida ^* and used this circumscription:

• order Piperales

  family Chloranthaceae

  family Piperaceae

  family Saururaceae

The Engler system, in its update of 1964, placed the order in subclassis Archychlamydeae in class Dicotyledoneae ^* and used this circumscription:

• order Piperales

  family Chloranthaceae

  family Lactoridaceae

  family Piperaceae

  family Saururaceae

The Wettstein system, latest version published in 1935, assigned the order to the Monochlamideae in subclass Choripetalae of class Dicotyledones. It used the circumscription:

• order Piperales

  family Piperaceae

Piperales

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