सूअर (Pig) या पालतू सूअर, जिसका वैज्ञानिक नाम सुस डोमेस्टिकस है, सूइडाए कुल (वराहकुल) की एक जीववैज्ञानिक जाति है। कुछ स्रोतों के अनुसार यह जंगली सूअर की एक उपजाति है, जिसमें मानवों ने पालतूकरण द्वारा कुछ बदलाव कर दिये हैं। यह विश्वभर में पाया जाता है।

The pig, also called swine or hog, is an omnivorous, domesticated, even-toed, hoofed mammal. It is named the domestic pig when distinguishing it from other members of the genus Sus. It is considered a subspecies of Sus scrofa by some authorities, but as a distinct species by others. Pigs were domesticated in the Neolithic, both in East Asia and in the Near East. When domesticated pigs arrived in Europe, they extensively interbred with wild boar but retained their domesticated features.