The Ellerslie Sires Produce Stakes, currently known as the Sistema Stakes, is a Group One horse race for Thoroughbred two-year-olds held at Ellerslie Racecourse.
Run over 1200 metres on Champions Day in March, it is regarded as one of New Zealand's best two-year-old races along with the Manawatu Sires Produce Stakes (1400 m) at Awapuni, Palmerston North.
The race has also been called the Diamond Stakes or Auckland Diamond Stakes.
In 2023 the first horse past the winning post, Tokyo Tycoon, was disqualified due to a post-race positive result to meloxicam.