The highest authority in the City of Lahti resides with the City Council. The City Council of Lahti has 59 members elected by the residents.
The City Board is in charge of the procurements and financial management of Lahti as well as preparing and implementing decisions by the Council. The 13-member City Board works for the interests of Lahti. Mayor Pekka Timonen, working under the City Board, manages the operations and finances of the City and helps with coordinating officeholder preparations and political goals.
The City has five boards, two divisions under the City Board and three regulatory committees. The organisation of the City of Lahti is based on a division by service department, and the services of the City are organised by Educational and Cultural Services and Technical and Environmental Services. Administrative Affairs takes care of the central administration. The City employs more than 3,000 professionals.