Which holiday commemorates the president's birthdays in the U.S.?

Presidents' Day is the holiday that commemorates the birthdays of U.S. presidents, most notably George Washington and Abraham Lincoln. It is observed on the third Monday in February and serves as a celebration of the contributions and achievements of all American presidents throughout history. The holiday was originally established to honor Washington's birthday, which is on February 22, but it has evolved to recognize the legacy of all U.S. presidents.

In contrast, Memorial Day is dedicated to honoring military personnel who have died in service to the country, Labor Day celebrates the American labor movement and the contributions of workers, and Columbus Day commemorates Christopher Columbus's arrival in the Americas. Each of these holidays serves a distinct purpose unrelated to the commemoration of U.S. presidents, making Presidents' Day the clear answer to the question.