Sir John Arnold Clark (27 November 1927 – 10 April 2017) was a Scottish billionaire businessman. He was the chairman and chief executive of Arnold Clark Group. In April 2015, the company celebrated its 60th year in business. He was born in Glasgow. His estimated fortune in 2016 was £1.025 billion.
In the 2004 New Year Honours, Clark was knighted, for services to the motor industry, and for his community work in Scotland.
Clark died on 10 April 2017 from natural causes in his home in Glasgow at the age of 89.