Mohammed Mahdi Al Tajir (Arabic: محمد مهدي التاجر) (born 26 December 1931) is a Bahraini-Emirati businessman based in the United Kingdom. He was the first United Arab Emirates ambassador to the United Kingdom and non resident ambassador to France. 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 men with wealth of £1.72 billion in the Sunday Times Rich List 2010.