Sunnyside was a mining town in eastern Victoria, 32 km north of Omeo. It was situated on the Mount Wills mining field, facing north and hence exposed to the sun. Its situation contrasted with Glen Wills on Mount Wills’ southern slope.
In 1890 the discovery of tin at Mount Wills raised high hopes of a mining revival that would rival Broken Hill. Over-estimation of the ore deposit and problems with accessibility dampened prospects, but gold emerged as a more profitable venture within a few years. A settlement estimated to number 500 people was formed at Sunnyside.