- Democratic Party (United States) presidential primaries, 2008
- Republican Party (United States) presidential primaries, 2008
- April 2008: 2008 Constitution Party National Convention, to be held in Kansas City, Missouri.
- May 23-26, 2008: 2008 Libertarian National Convention, to be held in Denver, Colorado.
- June 2008: Unity 08 National Convention, to be held online.
- July 10-13, 2008: 2008 Green Party National Convention, to be held in Chicago, Illinois.
- August 25-28, 2008: 2008 Democratic National Convention, to be held in Denver, Colorado.
- September 1-4, 2008: 2008 Republican National Convention, to be held in Saint Paul, Minnesota.
- November 4, 2008: All 50 states and the District of Columbia will hold elections to select members of the Electoral College.
- December 15, 2008: Members of the U.S. Electoral College meet in each state to cast their votes for President and Vice President.
- January 6, 2009: Electoral votes officially tallied before both Houses of Congress. This is the last opportunity for the certification of a state's electoral votes to be contested.
- January 20, 2009: Inauguration Day.