Following a period of strong growth, the newly-created role is seen as an important hire as the business enters its next phase, the firm says.
Ms Lyons has more than over 20 years financial services marketing experience and joins from Ascentric, where she was most recently head of marketing & proposition.
Martin Jennings, CEO for Parmenion, said: “Sarah brings a unique set of skills and experience but more importantly a strategic vision for the future of our industry.
“Sarah has a rare skill in being able to translate strategic opportunity into action.
“Sarah will work with the management team to develop our strategy, build on our market leading proposition and further develop our brand.
"She joins the business at an exciting time as we look to successfully continue our path of innovation and challenging the industry status quo.”
Ms Lyons said: “I am delighted to be joining Parmenion and the Standard Life Aberdeen Group.
"Parmenion is a rapidly growing business and has an excellent reputation, they have a fantastic proposition and ambitious growth plans and I am delighted to join the team.”