海鸥（学名：Larus canus）是一种中等体型的鸥。一般食小鱼和其他水生生物，也有吞食其他鸟类的记录，也曾吞食过兔子。

海鸥腿及无斑环的细嘴绿黄色，白尾，初级飞羽羽尖白色，具大块的白色翼镜。冬季头及颈散见褐色细纹，有时嘴尖有黑色。海鸥身姿健美，惹人喜爱，其身体下部的羽毛就像雪一样晶莹洁白。

For the common gull butterfly, see Cepora nerissa.

The common gull (Larus canus) is a medium-sized gull which breeds in northern Asia, northern Europe and northwestern North America. The North American subspecies is commonly referred to as the mew gull, although that name is also used by some authorities for the whole species. It migrates further south in winter. There are differing accounts as to how the species acquired its vernacular name (see Etymology section below).