The electoral district of Belfast was an electorate of the Victorian Legislative Assembly in the British colony of Victoria. It was one of the original lower house seats in the first Parliament of Victoria in 1856. Belfast was renamed in 1889 to Port Fairy after the town of Belfast was also renamed.

The Constitution of Victoria 1856 described the boundary of the electoral district of Belfast as:

"Commencing at a point on the sea coast bearing south 7 degrees 30 minutes west, 16 chains 25 links from the south-west angle of section No. 15, township of Belfast, and bounded on the west by a line bearing north 62 chains; on the north by a line bearing east 45 chains 25 links; again on the west by a line bearing north 3 chains 75 links to the River Moyne, by that river to its mouth, and by the sea coast to the point of commencement; also that portion commencing at the south-west angle of section A, parish of Belfast, and bounded on the north-east by a line bearing north-west 15 chains to the Moyne Saltwater Lagoon, by that lagoon and the River Moyne to its mouth and by the sea coast northerly to the last mentioned point of commencement."

Member	Term
Francis Beaver	1856–1859
John Hood	1859–1864
Augustus Greeves	1864–1865
Gordon Evans	1866–1867
Henry Wrixon	1868–1877
Sir John O'Shanassy	1877–1883
John Madden	1883–1888
Sir Bryan O'Loghlen	1888–1889

O'Loghlen went on to represent the renamed Port Fairy from 1889.

38°22′S 142°14′E / 38.367°S 142.233°E / -38.367; 142.233