Westminster Advisers was appointed by virtue of its transport sector experience and expertise in helping organisations to manage stakeholder relationships within complex regulatory environments.
The team working with APCOA is led by account director Lizzie Wills and director Marc Woolfson.
Dominic Church, managing director of Westminster Advisers said: "The Government is poised to set out its motoring and parking reforms and the localism agenda continues to gain momentum as local authorities face budgetary pressures.
"We look forward to ensuring that APCOA, as a market leading parking provider, has a strong voice in this debate."
Kim Challis, managing director of APCOA Parking, UK & Ireland, added: "Their appointment comes at an important time, not just for APCOA but for the wider parking industry as a whole. We’ve been impressed by Westminster Advisers’ dynamic team of consultants, and we’re looking forward to working with them in the months ahead."
Westminster Advisers' clients include Halfords, Sodexo and the Cycle to Work Alliance.