Mahdi Al Tajir (Arabic: مهدي التاجر‎) is an Emirati businessman based in the United Kingdom. Al Tajir spends much of his time at his London home or at Keir House, his 18,000-acre (73 km2) Perthshire estate. He has interests in finance and property, and owns the Highland Spring bottled water company.Al Tajir was named one of Scotland's richest man with wealth of £1.72 billion in the Sunday Times Rich List 2010.