Major William Drummond Mercer (1796–1871) was a British Army officer, landowner, pastoralist and politician in colonial New South Wales.
[2] Major Mercer, having retired from the 16th Lancers, departed Calcutta and arrived in Hobart in March 1838 along with his cousin, Lieutenant George Duncan Mercer.
[1][2] Mercer was elected to the district of Port Phillip in the New South Wales Legislative Council in June 1850.
[1] He held that seat until it was abolished prior to the creation of Victoria (Australia) as a separate colony.
Mercer returned to Scotland and settled in Perthshire.