MTA may refer to:

A transit district or transit authority is a special-purpose district organized as either a corporation chartered by statute, or a government agency, created for the purpose of providing public transportation within a specific region.

In the United States, this is usually within one state, but in rare circumstances may cover two or more states. The term used depends on which part of the country the agency is created in. Typically, western states will create a "transit district" and eastern states create a "transit authority" but the type of agency is generally the same.

A transit district is created to give it the power of the government in dealing with solving problems related to transit issues. This includes the powers of eminent domain to obtain space for rights of way (e.g. for railways or busways), the ability to impose excise, income, property, and/or sales taxes to fund subsidies of operating costs of local transportation, and the ability to operate independently of the cities and counties that the transit district operates within. A transit district may also have its own transit police force, although in some areas the local police provide a special bureau for this purpose.

The Public Transport Corporation was a State Government of Victoria owned corporate body formed under the Transport Act 1983 which operated passenger and freight trains, trams and bus services in Victoria, Australia.

The Corporation was also responsible for directly operating some bus services and procuring bus services from private operators. The Public Transport Corporation was established from 1 July 1989 as a result of the passage and commencement of the Transport (Amendment) Act 1989 to manage the responsibilities of the State Transport Authority and the Metropolitan Transit Authority. In suburban Melbourne it traded as "The Met" while in regional Victoria it operated as "V/Line".

The operational rail activities of the corporation were franchised in 1999 by the Kennett Government through the intermediary of a new agency, the Director of Public Transport, a statutory office within the Department of Transport. The Director was required entered into franchise agreements with private rail and tram companies for the on the ground delivery of public transport services. The land and infrastructure assets of the Public Transport Corporation were transferred to another new agency, VicTrack (the Victorian Rail Track Corporation). VicTrack then leased those assets to the Director of Public Transport, which in turned sub leased the assets to the new private operators.