The Otago Province was a province of New Zealand until the abolition of provincial government in 1876. The capital of the province was Dunedin. Southland Province split from Otago in 1861, but became part of the province again in 1870.
Otago Province was one of the six original provinces established in New Zealand in 1853. It covered the lower third of the South Island. Its northern neighbour was the Canterbury Province, and the boundary was the Waitaki River from the Pacific Ocean to its source in the Southern Alps, and from there a straight line to Awarua Bay (now known as Big Bay) on the west coast. The inland area of the Waitaki catchment was unexplored in 1853 and dispute later arose over which branch of the Waitaki should form the boundary. The boundary was delineated in 1861 as following the Ohau River to Lake Ohau and from there a straight line to Mount Aspiring and Awarua Bay.
Southland Province split from Otago in 1861, but became part of the province again in 1870. All the New Zealand provinces were abolished at the end of 1876.