McIntosh, who has been promoted from the role of operations director, joined the company in February 2010.
She said: "I am delighted to have been appointed as the new managing director of Roselle. 2011 was an extremely successful year for Roselle with a 30% growth on our annual turnover from the previous year."
The firm has also made another key appointment with Amanda Kirk becoming business development manager.
She will be tasked with growing the company's core business within the pharmaceutical, energy and financial sectors as well as establishing key relationships in distribution and procurement.
McIntosh added: "We are excited to welcome Amanda to the Roselle team. Her job will be extremely important in the company as we continue to maintain our focus and grow our business in the UK."
Roselle, which has offices in Aberdeen and Edinburgh works with a range of blue chip clients organising events from award dinners and dinner dances to product launches.
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