SS Wimmera was a passenger steamship that was built in 1904 by Caird & Company in Greenock, Scotland, for Huddart Parker & Co of Melbourne, Australia.

She was sunk on 26 June 1918 by a German mine north of Cape Maria van Diemen, New Zealand, killing 26 passengers and crew.

At 10:00 am on 25 June 1918 the ship left Auckland, New Zealand, bound for Sydney, Australia, via Three Kings Islands.

Her route was to take her north towards the Three Kings Islands where she would turn west and south toward Sydney.

However, at 5:15 a.m. on 26 June 1918 she struck a mine laid by the German merchant raider SMS Wolf and sank.