Cosheston is a village and parish in Pembrokeshire, Wales. It is situated on an inlet of the Daugleddau estuary, 3 km north-east of Pembroke. The northern part of the parish is in the Pembrokeshire Coast National Park. Together with the parishes of Upton and Nash, it constitutes the community of Cosheston, which had a population of 713 in 2001, increasing to 828 at the 2011 Census. With the community of Lamphey, it makes up the Pembrokeshire ward of Lamphey.