Texa (Scottish Gaelic: Teacsa) is a small island 700 metres (770 yd) directly south of Islay, in the Inner Hebrides, Scotland. It reaches a height of 48 metres (157 ft) at its highest point, Ceann Garbh. It is part of the parish of Kildalton on Islay. The distilleries of Laphroaig and Lagavulin are nearby on the Islay coast, as well as Port Ellen. It is currently uninhabited, but is home to wild goats, as well as otters.
The island has its own fresh water supply at Tobar Moireig. The rock is mainly schist and some hornblende.
Texa has tentatively been identified as the Oidecha Insula written about by St Adomnan. The etymology of the name is disputed – it may represent either the Old Irish tech (house – taigh in modern Scottish Gaelic) or Oideachd/Oideachas, a word for a religious seminary.
Adomnan mentions that St Cainneach (Kenneth) used "Oidecha Insula" as a stopping place on his journey between Iona and Ireland. Kenneth is said to have left his crozier on Iona on this journey, so St Columba blessed it, cast it into the sea, and it washed up on Oidecha where Kenneth found it.