Shannon Free Zone is a 2.43 square kilometres (600 acres), international business park adjacent to Shannon Airport, County Clare, Ireland which is 18 km from Ennis and 20 km from Limerick. Businesses based on the site enjoyed special tax incentives on staff and profits until 2003. This attracted a large number of multinational companies. Currently there are over 100 international firms and 6,500 people employed at Shannon Free Zone in a diverse range of activities. Companies who have invested at Shannon include Avocent, DeBeers Industrial Diamonds (Now Element Six), Kraus & Naimer, GE Capital, Precision Castparts Corp., Genworth, Ingersoll Rand, Intel, John Crane, Lufthansa Technik, Mentor Graphics, Molex, Illinois Tool Works, RSA Security, Ohshima, Schwarz Pharma and Zimmer.
The Free Zone is managed by Shannon Development, an Irish government agency. It was established in 1959, as the world's first Free Trade Zone. With Shannon Airport almost entirely depending on transit passengers and refueling for trans-Atlantic flights, the lack of support from the Government and the clear signs that commercial aircraft would soon have the range to bypass the airport, Brendan O'Regan, the director, realised that something had to be done. He submitted a proposal for a special manufacturing zone with special tax incentives. This would create dearly needed jobs and specific Shannon Airport bound air traffic. The site adjacent to the airport was established in 1959, the second zone, Smithstown, a number of years later.