Inishturk (Inis Toirc in Irish, meaning Wild Boar Island) is an inhabited island of County Mayo, in Ireland.

The island lies about 15 km (9 mi) off the coast; its highest point reaches 189.3 m (621.1 ft) above sea level. Between Inisturk and Clare Island lies Caher Island. It has a permanent population of 58 people. There are two main settlements, both on the more sheltered eastern end of the island, Ballyheer and Garranty. Bellavaun and Craggy are abandoned settlements.

Inishturk has been inhabited on and off since 4,000 BCE and has been inhabited permanently since at least 1700. Some of the island's more recent inhabitants are descended from evacuees from Inishark to the southwest.

A Martello tower was built during the Napoleonic Wars, c. 1805, on Inishturk's western coast.

In 1993, Inishturk Community centre was opened, this community centre doubles as a library and a pub. In June 2014 the ESB commissioned three new Broadcrown BCP 110-50 100kVA diesel generators to supply electricity to the island. The ESB have operated a diesel power station on the island since the 1980s

Inishturk gained international attention in 2016 after a number of websites claimed that the island would welcome any American "refugees" fleeing a potential Donald Trump presidency. These were examples of the type of "fake news" that arose during the 2016 US presidential election campaign.

The island is home to a primary school on the island which in 2011 had only 3 pupils; this is believed to be the smallest primary school in Ireland.

The table below reports data on Inisturk's population taken from Discover the Islands of Ireland (Alex Ritsema, Collins Press, 1999) and the Census of Ireland.

Historical population

Year Pop. ±% 1841 577 —     1851 174 −69.8% 1861 110 −36.8% 1871 112 +1.8% 1881 116 +3.6% 1891 135 +16.4% 1901 135 +0.0% 1911 132 −2.2% 1926 101 −23.5%	Year Pop. ±% 1936 107 +5.9% 1946 125 +16.8% 1951 123 −1.6% 1956 110 −10.6% 1961 108 −1.8% 1966 92 −14.8% 1971 83 −9.8% 1979 85 +2.4% 1981 76 −10.6%	Year Pop. ±% 1986 90 +18.4% 1991 78 −13.3% 1996 83 +6.4% 2002 72 −13.3% 2006 58 −19.4% 2011 53 −8.6% 2016 51 −3.8% 2022 56 +9.8%
Source: Central Statistics Office. "CNA17: Population by Off Shore Island, Sex and Year". CSO.ie. Retrieved 12 October 2016.

Prior to 1997 there was no scheduled ferry service and people traveled to and from the islands using local fishing boats. Since then a ferry service operates from Roonagh Quay, Louisburgh, County Mayo. The pier was constructed during the 1980s by the Irish government, around this time the roads on the island were paved.

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  Inisturk and Caher island
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  Inishturk pier
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  Harbour with Caher Island in background
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  Community centre
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  Freshwater lake
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  Clare Island as seen from Inishturk
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  Power station

• Inishdalla
• Inishbofin, County Galway
• List of islands of Ireland

• Media related to Inishturk at Wikimedia Commons
• Podcast series on Mayo's Heritage, including a heritage Tour of Inishturk Archived 20 June 2010 at the Wayback Machine
• Mayo News - Inishturk islander committed to her community Archived 11 July 2021 at the Wayback Machine
• Island life Inishbofin Inishturk
• Irish Islands - Inishturk