The politics of Canada functions within a framework of parliamentary democracy and a federal system of parliamentary government with strong democratic traditions. Canada is a constitutional monarchy where the monarch is head of state. In practice, executive authority is entrusted to the Cabinet, a committee of ministers of the Crown chaired by the Prime Minister of Canada that act as the executive committee of the King's Privy Council for Canada and are responsible to the democratically elected House of Commons.

A two-party system is a political party system in which two major political parties consistently dominate the political landscape. At any point in time, one of the two parties typically holds a majority in the legislature and is usually referred to as the majority or governing party while the other is the minority or opposition party. Around the world, the term has different meanings. For example, in the United States, the Bahamas, Jamaica, and Zimbabwe, the sense of two-party system describes an arrangement in which all or nearly all elected officials belong to either of the two major parties, and third parties rarely win any seats in the legislature. In such arrangements, two-party systems are thought to result from several factors, like "winner takes all" or "first past the post" election systems. The electoral competition is mostly limited to the two major parties.