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21 Battalion
Commanding Officers
page 463
page 464
Commanding Officers
| Lt-Col N. L. Macky | 12 Jan 1940–17 May 1941 |
| Maj (actg Lt-Col) E. A. Harding | 20 Apr 1941–17 May 1941 |
| Lt-Col J. M. Allen | 17 May 1941–28 Nov 1941 |
| Maj T. V. Fitzpatrick | 28 Nov 1941–3 Dec 1941 |
| Maj R. W. Harding | 3 Dec 1941–7 Dec 1941 |
| Lt-Col S. F. Allen | 7 Dec 1941–10 May 1942 |
| Maj R. W. Harding | 10 May 1942–12 Jun 1942 |
| Lt-Col S. F. Allen | 12 Jun 1942–15 Jul 1942 |
| Maj H. M. McElroy | 15 Jul 1942–18 Jul 1942 |
| Lt-Col R. W. Harding | 18 Jul 1942–30 Apr 1943 |
| Lt-Col M. C. Fairbrother | 30 Apr 1943–14 May 1943 |
| Lt-Col R. W. Harding | 14 May 1943–4 Jun 1943 |
| Lt-Col H. M. McElroy | 4 Jun 1943–21 Jun 1944 |
| Lt-Col A. C. Trousdale | 21 Jun 1944–9 Jul 1944 |
| Lt-Col J. I. Thodey | 9 Jul 1944–30 Oct 1944 |
| Lt-Col E. A. McPhail | 30 Oct 1944-25 May 1945 |
| Lt-Col J. I. Thodey | 25 May 1945–2 Dec 1945 |