Island Bay is a former New Zealand electorate, centred on Island Bay in the southern suburbs of Wellington.
The seat was held by five MPs from the Labour Party for the whole of its existence from 1946 to 1996.
Robert McKeen was the Speaker of the House of Representatives from 1947 to 1950.
Arnold Nordmeyer was Minister of Finance in the Second Labour Government from 1957 to 1960, and is remembered for the black budget which contributed to Labour's defeat in 1960. In 1954 Nordmeyer had moved to the Island Bay seat when the Brooklyn seat was abolished.
Gerald O'Brien was deselected by Labour for the seat in 1978, and ran against the new Labour candidate Frank O'Flynn. O'Flynn was Minister of Defence in the Fourth Labour Government from 1984 to 1987.
| Election | Winner | |
| 1946 election | Robert McKeen (Labour) | |
| 1949 election | ||
| 1951 election | ||
| 1954 election | Arnold Nordmeyer (Labour) | |
| 1957 election | ||
| 1960 election | ||
| 1963 election | ||
| 1966 election | ||
| 1969 election | Gerald O'Brien (Labour) | |
| 1972 election | ||
| 1975 election | ||
| 1978 election | Frank O'Flynn (Labour) | |
| 1981 election | ||
| 1984 election | ||
| 1987 election | ||
| 1990 election | Elizabeth Tennet (Labour) | |
| 1993 election | ||