Milton is a residential area of the English city of Portsmouth, Hampshire, England, on the south eastern side of Portsea Island.

Milton is bordered on the eastern coast of Portsea Island by Langstone Harbour, with Eastney to the south-east, Southsea to the south-west, Baffins to the north and Fratton to the north-west.

Milton was originally a small village, surrounded by arable and market garden farmland until it was swallowed up by the expansion of Portsmouth across Portsea Island in the late 19th and early 20th centuries.

One of the original Middle Farm buildings remains; the thatched barn, which has been extended and is now the home of the Portsmouth Players amateur dramatic society.

There are several pubs located along the former canal path, partly delineating its route towards Landport where it ended at the eponymously named Arundel Street.

Part of the former Portsmouth and Arundel Canal was located directly south of Middle Farm (later Milton Park) which was built across Portsea Island to Landport.

There is also a permanent miniature railway track located in the centre of Bransbury Park run by Portsmouth Model Engineering Society members.

A traditional family-owned confectionery shop named "Gilbert's" has been trading in Milton Market since it first opened over a century ago.

Nowadays largely built on and with the former cornfields now occupied by the Langstone Campus of the University of Portsmouth, the remaining hospital grounds are still quite extensive and include a cricket field complete with clubhouse.

Another part of the grounds has been secured as a third public park for the area, St James' Green, on which community events are held and further features such as a children's Nature Trail are to be incorporated.

In the late 1990s, the eastern section of St Mary's Hospital (which incorporated Priorsdean) was redeveloped and became Miltoncross Academy school and a small housing development.

A further fact is that Fratton Park lies within the Milton Ward electoral district for Portsmouth City Council and national level parliamentary elections.

Milton Common is reclaimed land, formed between 1962 and 1970 when a chalk and clay bund was built across the mouth of the lake and the confined area was progressively drained and in-filled with domestic refuse and other waste.

In 1967, Hampshire County Council had planned for Milton Lake to be filled in and become the site of a major dual carriageway trunkroad (or "M276" motorway) that would have cut east–west through Portsea Island and connect to the M275 to form a loop.

Mostly consisting of makeshift houseboats, converted railway carriages and fisherman huts, many of these homes, lacking the basic amenities of electricity and plumbed water supplies, survived into the 1960s until they were cleared.