The Metropolitan Borough of Trafford is a metropolitan borough of Greater Manchester, England. It has a population of 211,800, covers , and includes the towns of Altrincham, Partington, Sale, Stretford, and Urmston.

The borough was formed on April 1, 1974 by the Local Government Act 1972 as a merger of the boroughs of Altrincham, Sale, and Stretford, the urban districts of Bowdon, Hale, and Urmston and part of Bucklow Rural District. All were previously in Cheshire, apart from Stretford and Urmston which were in Lancashire. The River Mersey flows through the borough, separating North Trafford from South Trafford. Historically the Mersey also acted as the boundary between the historic counties of Lancashire and Cheshire.

The Trafford area has a long heritage, with evidence of Neolithic, Bronze Age, and Roman activity. Amongst the relics of the past are three castles - one of them a Scheduled Ancient Monument - and over 200 listed buildings. The area underwent change in the late 19th century and the population rapidly expanded with the arrival of the railway. Trafford is the home of Manchester United F.C., Lancashire County Cricket Club, Manchester Phoenix, and formerly Sale Sharks. Also in Trafford is the Imperial War Museum North.

Trafford has a strong economy with low levels of unemployment and the Trafford Park industrial estate and Trafford Centre - a large out-of-town shopping centre; apart from the City of Manchester, Trafford is the only borough to be above the national average for weekly income. Socially, the area is middle class and contains commuter towns. Altrincham and Sale West is the only constituency in Greater Manchester to be controlled by the Conservative Party. Trafford has the best record for education in Greater Manchester.