He will take over from David Norgrove, who left to chair the Pensions Regulator.
David Eyre has been operating as interim chairman over the past few months.
M&S chairman Paul Myners said: 'Tony's appointment is consistent with the engagement I have been giving to increasing the professionalism of trustee work.'
Watson added: 'The Scheme has more than 130,000 members, for whom current and future payments are a key element of their financial planning.
'However, there is an absolute need to safeguard the well-being and exposure of the Scheme while also respecting shareholders' interests.'
Watson will take up the role on April 1.
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