The Celtic Array was a proposed UK round 3 offshore wind farm in the Irish Sea south east of the Isle of Man.

In July 2014 the developers terminated plans for the wind farm due to unviable turbine foundation costs.

In late 2007 the UK Department for Business, Enterprise and Regulatory Reform instigated studies to identify offshore wind sites for around 25 GW of generating capacity;[1] the study, the Offshore Energy Strategic Environmental Assessment (OESEA1, 2009) identified up to 33 GW of potential offshore wind power within English and Welsh territorial waters at sea bed depth of less than 60 m (200 ft); In June 2008 the "Round 3" phase of UK offshore development was announced, subsequently the OESEA plan was adopted, and the Crown Estate designated several areas of potential development, and began a competitive tender process to allocate the sites to developers.

[13] In July 2014 plans for the wind farm were terminated by Centrica and Dong, due to the foundation requirements being beyond what was currently financially viable.

[18] The wind farm site had a maximum area of 497 km2 (192 sq mi) with water depths of 36 to 83 m (118 to 272 ft) with a tidal range of up to 8.5m.