Ian Winchester (born 27 May 1973) is a discus thrower from New Zealand.
He finished tenth at the 1992 World Junior Championships, eighth at the 1998 World Cup and fifth at the 1998 Commonwealth Games (where he also finished eighth in shot put) He also competed at two World Championships (1997, 1999) as well as the 2000 Summer Olympics without reaching the final round.
His personal best throw is 65.03 metres, achieved in May 2002 in Salinas. This was the New Zealand national record until it was broken by Connor Bell in 2023.