Macleay Island is an island in Moreton Bay, South East Queensland, Australia. The island constitutes a town and locality within the City of Redland. In the 2021 census, Macleay Island had a population of 3,193 people.

For some time in the 1800s the island was called Tim Shea's Island after a convict who lived on the island for more than a decade. The current name was given by surveyor James Warner who named the island after Alexander Macleay who was the Colonial Secretary of New South Wales from 1825 to 1837.

A map advertising land for sale by John Cameron auctioneer, in central Macleay, Macleay Island consisted of 308 marine villa sites each of 1/4 acre and upwards to be held on the ground on Friday 10 December 1886. The land on offer bordered Kalara Street to the north, Kate Street to the east and Karrawarra Street to the south. The advertisement offered a free trip by steamer and free luncheon to attendees with terms 1/4 cash balance by promissory note at 3,6,9,12 and 15 months with 8% added.

Macleay Island State School opened on 28 January 1986 and still operates today.

During the 2006 state election, the Queensland Government prioritised construction of a single-officer police station on the island as it was needed with the increasing population.

In 2007, after a short segment on the Nine television network's nationally broadcast A Current Affair based on the comments made by real estate watcher John Edwards of Residex said that Macleay Island was a "boom suburb" and worth watching by first home buyers. All the South Moreton Bay Islands received a considerable amount of interest from buyers. A surge in building followed which forced the Redland City Council revise its population estimates. It estimated 2,319 permanent residents on Macleay in 2008. However, with a count of 1,479 dwellings, the peak number of people on the islands during holidays and weekends the total population is thought to have been 3,254.

In the 2006 census, Macleay Island had a population of 1,958. However, owners who visit the island at weekends. Nearly a third of the 1,259 dwellings were listed as unoccupied at the time of the Tuesday night census.

In the 2011 census, Macleay Island had a population of 2,572 people, 49.9% female and 50.1% male. The median age of the Macleay Island population was 52 years, 15 years above the national median of 37. 68.3% of people living in Macleay Island were born in Australia. The other top responses for country of birth were England 7.1%, New Zealand 6.7%, Germany 1.4%, Scotland 1.2%, Netherlands 0.6%. 87.9% of people spoke only English at home; the next most common languages were 1.2% German, 0.3% Italian, 0.2% French, 0.2% Auslan, 0.2% Greek.

In the 2016 census, Macleay Island had a population of 2,681 people.

In the 2021 census, Macleay Island had a population of 3,193 people.