猪形亚目（学名：Suina）是偶蹄目的一个演化支，现存仅包含二个科：

• 猪科 Suidae：猪；
• 西猯科 Tayassuidae：西猯；

河马科曾被归类于此，但现已和鲸类一起归类为河马形类（Cetacodonta），河马形类与反刍亚目的亲缘关系更近。

The suborder Suina (also known as Suiformes) is a lineage of omnivorous non-ruminant artiodactyl mammals that includes the pigs and peccaries of the families Suidae and Tayassuidae and their fossil kin. Hippopotamidae had historically been classified among the Suina for morphological reasons, but is now more often classified as the sister group of the whales, or Cetacea.