| Granny McDonald | |
| Full Name: | Hedwick Wilhelmina McDonald |
| Birth Date: | 28 April 1893 |
| Birth Place: | Hastings, New Zealand |
| Death Place: | Palmerston North, New Zealand |
| Occupation: | Racehorse trainer |
Hedwick Wilhelmina "Granny" McDonald (28 April 1893 - 5 October 1959) was a New Zealand racehorse trainer. She was born in Hastings, Hawke's Bay, New Zealand on 28 April 1893.
She was the trainer of the 1938 Melbourne Cup winner Catalogue. Whilst she was a registered horse trainer in New Zealand, women were not then allowed to register as horse trainers in Australia. Thus, Catalogue was entered into the Melbourne Cup with Hedwick's husband Allan as the official registered trainer.