Ontario’s Parliament is unicameral, similar to other Canadian provinces, having one Legislative Chamber. It is comprised of the 124 elected Members of Provincial Parliament (MPPs), and the Monarch represented by the Lieutenant Governor of Ontario. Each MPP represents a geographical area of the province, called an electoral district, riding or constituency. In parliament, Members of Provincial Parliament represent their constituents and participate in the legislative process - they introduce bills, propose amendments to current legislation, and vote on bills and motions. MPPs also present petitions on behalf of their constituents and bring forward issues related to their own riding.  Ontario is the only province in Canada to use the term Member of Provincial Parliament (MPP) for its elected provincial representatives.

The proceedings in the Legislative Assembly of Ontario are conducted according to the Standing Orders. Government is the administrative body who sets policy and consists of the Premier, and the executive Council (Cabinet). The party that elects the greatest number of members forms the provincial government.  

A parliamentary tradition at Ontario's Legislature - the Speaker's Procession.