Hilsea

infobox UK place
country = England
latitude= 50.83
longitude= -1.07
official_name= Hilsea
unitary_england= Portsmouth
lieutenancy_england= Hampshire
region= South East England
constituency_westminster= Portsmouth North
post_town= SOUTHSEA
postcode_district = PO2
postcode_area= PO
dial_code= 023
os_grid_reference=

Hilsea is a district of the city of Portsmouth in the English county of Hampshire. Hilsea is home to one of Portsmouth's main sports and lesiure facilities - the Mountbattern centre. The City of Portsmouth Boys' School is also in Hilsea.

Located at the northern end of Portsea Island, for most of its history, Hilsea was a small hamlet on the Portsmouth to London road. The boundaries of Portsmouth were not extended to encompass the hamlet until 1832. The last working farm in Portsmouth, Green Farm, was located in the area up to the 1990s. This area is now a residential estate and is marked by a pub and hotel known as the Green Farm.

Modern Hilsea is a mixture of residential and industrial areas. The north of the district composes the Hilsea Lines, former defensive fortifications that are now a nature reserve. One of the major routes into Portsmouth still runs through the area. In addition, a small station serves the area.