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In jurisdictions which use the Westminster system of government or a similar system, leaders debates are often held, usually during a general election campaign. These debates are normally televised and are often organized by one or more television stations.

The success of early televised debates such as the 1960 American presidential debate between John F. Kennedy and Richard Nixon would eventually spur the desire to hold similar, televised debates in countries under the Westminster system. Television had quickly proven to be an excellent and efficient means of reaching out to large blocs of the electorate. The unique aspect of the Westminster system which creates the desire to hold leaders debates is that the party leader is usually the party's presumed candidate to lead the government, because by constitutional convention he or she will usually become prime minister or premier if his or her party wins the most seats. However, a leaders debate is not technically a candidates debate in the same sense that an American presidential debate would be, because in the latter case the American political parties have explicitly nominated the named individuals as their candidates for president and vice president.

Leaders debates are often popular with voters, whose decisions might be greatly influenced by the outcome. Leaders have occasionally attempted to use props (such as charts or signs bearing slogans) during a debate with varying degrees of success.

The exact format for a leaders debate varies, but normally the debate will begin with each leader making a short opening statement. Then a panel of well-known journalists will ask sets of prepared questions, which are to be answered either by all of the leaders or by one specific leader. After the leader(s) answer each question, the other leader(s) may get a chance to make a brief response, after which there may be some time allocated for an often heated "free for all" debate. The moderator will usually attempt to exercise some control through all of this, and then stop the debate after time has elapsed so the next question can be asked. After the panelists finish asking questions, each leader will make his or her closing remarks and the debate will end.

Who gets invited to participate in a leaders debate is often a sensitive issue. Some jurisdictions may have dozens of fringe political parties which few networks would care to have participating in their debates. For the sake of brevity, and to ensure the leaders of the main parties have adequate time to adderss voters on a wide range of issues, it is extremely rare for any leaders debate to have more than five leaders. A more common number would be three. Leaders debates are often restricted to parties which elected representatives in the previous election. Exceptions may be made for parties with close to a full slate of candidates, but this is not always the case. For example, in Canada in 2004, the Green Party of Canada was excluded from the federal leaders debates, and the Alberta Alliance was excluded from the Albertan provincial leaders debate, even though both parties had full slates in their respective elections. Parties that are excluded will often complain bitterly about their exclusion, sometimes claiming that the political establishment has conspired in an effort to keep their party on the political fringe.

• U.S. presidential election debates
• French presidential debates
• Debate
• You had an option, sir