Matthew David Mileham (born 27 December 1956) is a British retired hammer thrower. He represented Great Britain at two consecutive Summer Olympics, starting in Los Angeles in 1984 and the 1988 Summer Olympics.
Mileham finished second behind Australian Peter Farmer at the 1979 AAA Championships but by virtue of being the highest placed British athlete was considered the British hammer throw champion
Mileham was an NCAA champion thrower for the Fresno State Bulldogs track and fieldm team, winning the hammer throw at the 1984 NCAA Division I Outdoor Track and Field Championships. He was also an All-American weight thrower.
Mileham finished runner-up twice more at the AAAs in 1982 and 1986 and represented England in the hammer event, at the 1986 Commonwealth Games in Edinburgh, Scotland.
A student at California State University, Fresno he later worked as an electrical engineer. He was married to Olympian discus thrower Dr. Lacy Barnes-Mileham until they divorced in October 2009. Dr. Lacy Barnes-Mileham also attended Fresno State and was a discus thrower at the 1996 Summer Olympics in Atlanta, Georgia.