The gender gap in voting is one of the most well-documented findings in political behavior across democracies. However, gender gap research has traditionally assumed that everyone is either a man or a woman. How do nonbinary people differ from men and women in their party identification and voting behavior? We answer this question using data from the 2021 Canadian Election Study online panel. Nonbinary people are much less likely to identify with and vote Liberal or Conservative and much more likely to identify with and vote for the social democratic New Democratic Party (NDP) than both men and women. Many of these gaps persist even when restricting the analysis to LGBTQ respondents, adjusting for demographic variables that predict nonbinary identity, and adjusting for issue attitudes. Nonbinary people’s distinctiveness from men and women suggests that researchers need to incorporate nonbinary people into studies of political behavior.