Teams Harry McMillan played for
| Hawke Cup | Mid-Canterbury (2020/21-2022/23) |
| New Zealand Under-17 Tournament | Canterbury Under-17s (2018/19) |
| New Zealand Under-19 Tournament | Canterbury Under-19s (2020/21) |
| New Zealand Secondary School Boys | St Andrew's College, Christchurch (2019/20) |
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