Celery (Apium graveolens) is a cultivated plant, variety in the family Apiaceae, commonly used as a vegetable. Depending on location, either its stalks, or its hypocotyl, are eaten and used in cooking.

In North America the dominant variety most commonly available in trade is "celery", Apium graveolens var. dulce, whose stalks are eaten raw, or as an ingredient in salads, or as a flavoring in soups, stews, and pot roasts.

In Europe the dominant variety most commonly available in trade is celeriac (Apium graveolens var. rapaceum) whose hypocotyl forms a large bulb which is eaten cooked, or as a the major ingredient in a soup. It is commonly, but incorrectly, called "celery root". The leaves of rapaceum are used as seasoning, but the stalks find only marginal use.

Celery seed is also used as a spice. The plant grows to 1 m (3.3 ft) tall.