Ian McKay Sinclair (1 June 1933 – 25 August 2019) was a New Zealand cricketer who played in two Tests in 1956.

[2][3] An off-spin bowler and useful tail-end batsman, Sinclair made his first-class cricket debut for Canterbury in the 1953–54 season when Matt Poore was in South Africa with the New Zealand team.

When Poore was away again in 1955–56, this time touring India and Pakistan, and Tom Burtt retired, Sinclair became Canterbury's leading spin bowler.

However, he took only one wicket (of Everton Weekes), New Zealand lost both matches, and he never played another Test.

Sinclair and his wife Azalea, a former New Zealand netball representative, were married for 63 years.