Major General Joseph Osbertus Hamley CB (25 September 1820 – 5 July 1911) was a British Army Officer who administered the New Zealand station of the British Army Military Store Department during the New Zealand Wars.

Taking up the position of Assistant Storekeeper of the Wellington Office of the Board of Ordnance in 1847, Hamley saw service in the Wanganui Campaign of 1847.

By 1859 the Military Store Department had replaced the Board of Ordnance, with Hamley in charge of the New Zealand station.

[6] Returning to England in 1870, Hamley was appointed in charge of Gun Wharf at Chatham, followed by postings to the War Office, Dover and Aldershot.

Hamley retired after fifty years of service (thirty-two overseas) with the honorary rank of Major General.