Donald Osmund Oslear, known as Don Oslear, is a retired test match cricket umpire from England. He was born in Cleethorpes, Lincolnshire, England, in 1929 and joined the first class panel at the age of 45 without any first class playing experience. He stood in five Test matches between 1980 and 1984 and eight One Day Internationals, including a semi-final of the 1983 World Cup.