List of Republicans who opposed Donald Trump presidential campaign, 2016

This is a list of notable Republicans and conservatives who announced their opposition to the election of Donald Trump, the 2016 Republican Party nominee and eventual winner of the election, as the President of the United States. It also includes former Republicans who opposed Trump's campaign and who left the Republican Party during the 2016 presidential election, as well as Republicans who endorsed a different candidate. It does not include Republicans who opposed Trump during the primaries but never announced opposition to Trump as the nominee. Some of the Republicans support Trump after he won the presidential election, while others continue to oppose Trump.

All candidates signed a pledge to eventually support the party nominee. The following refused to honor it after Trump became the Republican presidential nominee.

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