William Younghusband (1819 – 5 May 1863), sometimes known as "William Younghusband junior", was a businessman and politician in the colony of South Australia; one of the promoters of the Murray River Steam Navigation Company, which enabled Captain Cadell in 1853 to win the £4000 bonus offered by the Government of South Australia for the initiation of steam communication on the Murray.

In 1845, he and George Young founded a woolbroking and shipping business "William Younghusband, jun.

[4] This being the first stable administration formed subsequent to the disappearance of the old officials from public life, it fell to Mr. Younghusband to organise the various Government departments inaugurated under the new régime.

This he did with consummate ability, and for many years the public business of the colony was transacted on the lines he laid down.

Mr. Younghusband was a director of the Bank of Australasia, and retired from the Legislative Council by rotation in Feb.