The sponsorship deal is the latest in RSM’s drive to build brand awareness across its international network through its golf partnership strategy.
As part of Team RSM, Montgomerie joins fellow professional golfers Andy Sullivan, Paul Waring, Zach Johnson and Chris Kirk, as well as his former Ryder Cup captain Davis Love III.
He will wear RSM branded clothing during tournaments and act as an ambassador for the firm during media and personal engagements.
“I am delighted and very excited to be joining RSM as a golf ambassador, representing them on both the European Tour and in the USA on the PGA Tour Champions,” Montgomerie said.
“To be partnering with RSM at this time in my career, and at the same time as their success continues to grow is something I am very much looking forward to being a part of,” he added.
Since turning pro in 1987 Montgomerie has received a wealth of accolades, including being Europe’s number one player for an unbeaten seven-year run, going unbeaten in eight Ryder Cup singles matches and captaining the victorious 2010 European Ryder Cup team.
He was awarded an MBE in 1998, an OBE in 2005 and was inducted into the World Golf Hall of fame in 2013.