Badagry is a coastal town in South West Nigeria, lying between Lagos and the border with Benin. Founded in the early 18th Century on a lagoon off the Gulf of Guinea, its protected harbour led to the town becoming a key port in the export of slaves to the Americas. From the 1840s, following the suppression of the slave trade, Badagry declined significantly, but became a major site of Christian mission. In 1863 the town was annexed by Britain and incorporated into the Lagos colony . In 1901 it became a part of Nigeria. The correct spelling is Badagry and not Badagri.

Badagry subsists largely on fishing and agriculture, and maintains a small museum of slavery.