As is traditional for the third night of a political convention, the headlining speaker of the Democratic National Convention on Wednesday will be the vice-presidential nominee, Gov. Tim Walz of Minnesota.

But a full lineup of other speakers will take the stage before Mr. Walz does at the end of the night. They include the former House speaker Nancy Pelosi; the current House minority leader, Hakeem Jeffries; several senators and governors; and former President Bill Clinton.

Watchers will also hear from some people who aren’t famous or serving in official capacities, but who can speak on topics that the Harris-Walz campaign wants to emphasize. At least two Republicans who have turned against former President Donald J. Trump are also set to take the stage.

Here are some of those expected to appear:

• Senator Cory Booker of New Jersey

• Senator Catherine Cortez Masto of Nevada

• Senator Amy Klobuchar of Minnesota

• Senator Chris Murphy of Connecticut

• Representative Hakeem Jeffries of New York, the House minority leader

• Representative Nancy Pelosi of California, the former House speaker

• Representative Andy Kim of New Jersey

• Gov. Wes Moore of Maryland

• Gov. Josh Shapiro of Pennsylvania

• Pete Buttigieg, the transportation secretary and former presidential candidate

• Olivia Troye, a former adviser to Vice President Mike Pence

• Geoff Duncan, Republican former lieutenant governor of Georgia

• Former President Bill Clinton

• Gov. Tim Walz of Minnesota, the nominee for vice president