The second inauguration of Richard Nixon as president of the United States was held on Saturday, January 20, 1973, at the East Portico of the United States Capitol in Washington, D.C. This was the 47th inauguration and marked the commencement of the second and final term of both Richard Nixon as president and Spiro Agnew as vice president. Both Agnew and Nixon resigned within two years of this term. In December 1973, Gerald Ford replaced Agnew as vice president and in the following year, replaced Nixon as president. This made Nixon the first and, as of 2023, only person to be inaugurated four times as both president and vice president. Chief Justice Warren E. Burger administered both the presidential and vice presidential oaths of office. During the ceremony, Look With Pride On Our Flag, a song dedicated to President Nixon and composed by Hank Fort, was played.

The oath of office of the president of the United States is the oath or affirmation that the president of the United States takes upon assuming office. The wording of the oath is specified in Article II, Section One, Clause 8, of the United States Constitution, and a new president must take it before exercising or carrying out any official powers or duties.