Una Rebecca Ewert (born 11 January 1955) is a former New Zealand diver.
She represented her country at two Commonwealth games and she was the first New Zealand diver to attend an Olympics.
At the age of 15 she was selected to dive from three metres at the Commonwealth Games in Edinburgh in 1970.
Four years later she was diving again from the one metre board at the next Commonwealth games in Christchurch.
This biographical article relating to New Zealand diving is a stub.