"Niagara" is a two-part episode of the sixth season of the American comedy series The Office. It is the 4th and 5th episodes in the season's episode count and the 104th and 105th episode of the series overall. The episode was written by executive producer Greg Daniels and Mindy Kaling, and was directed by Paul Feig. It originally aired on October 8, 2009 on NBC in the United States.

The sixth season of the American television comedy The Office premiered in the United States on NBC on September 17, 2009, and concluded on May 20, 2010. The season consisted of 22 half-hour episodes, and 2 hour-long episodes to comprise the 26 total episodes of material created. The Office is an American adaptation of the British TV series, and is presented in a mockumentary format, portraying the daily lives of office employees in the Scranton, Pennsylvania branch of the fictitious Dunder Mifflin Paper Company. The season stars Steve Carell, Rainn Wilson, John Krasinski, Jenna Fischer, B. J. Novak, and Ed Helms, with supporting performances from Leslie David Baker, Brian Baumgartner, Creed Bratton, Kate Flannery, Mindy Kaling, Ellie Kemper, Angela Kinsey, Paul Lieberstein, Oscar Nunez, Craig Robinson, and Phyllis Smith.