Trifolium campestre, commonly known as hop trefoil,[1] field clover[2] and low hop clover, is a species of flowering plant native to Europe and western Asia, growing in dry, sandy grassland habitats, fields, woodland margins, roadsides, wastelands and cultivated land.

It is a herbaceous annual plant, growing to 10–30 cm tall, with distinctive yellow flowerheads that superficially resemble hop flowers.

The leaves are alternate and trifoliate, with three oblong or elliptical leaflets 4–10 mm long.

This species is very closely related to large hop trefoil (Trifolium aureum).

Hop trefoil is an important clover in agriculture because its foliage is good for feeding livestock and replenishing soil.