Dinish, (Irish: Daighinis), is a small island on the coast of Connemara in County Galway, Ireland.

The island is connected to the island of Lettermullen and is part of a group of islands collectively known as Ceantar na nOileán. The island has no permanent population and is not connected via a bridge, however access is possible via boat or on foot at low tide.

The island has had a permanent population in recent history with a population of nine families in 1911.

Dinish is mentioned in the essay "In Connemara" by John Millington Synge.

It was owned in the 1950s and 1960s by Dr Alfred Thompson Schofield, surgeon and author of "Scientific Diets for African Children" (1936) and a prominent missionary for the Church Missionary Society (Uganda).

Historical population

Year Pop. ±% 1841 59 —     1851 60 +1.7% 1861 75 +25.0% 1871 64 −14.7% 1881 74 +15.6% 1891 50 −32.4% 1901 56 +12.0% 1911 52 −7.1%	Year Pop. ±% 1926 25 −51.9% 1936 27 +8.0% 1946 43 +59.3% 1951 35 −18.6% 1956 29 −17.1% 1961 19 −34.5% 1966 14 −26.3% 1971 12 −14.3%	Year Pop. ±% 1979 3 −75.0% 1981 3 +0.0% 1986 1 −66.7% 1991 0 −100.0% 1996 0 0.00% 2002 0 0.00% 2006 0 0.00%
Source: Central Statistics Office. "CNA17: Population by Off Shore Island, Sex and Year". CSO.ie. Retrieved 12 October 2016.