Aaron Augustus Sargent (September 28, 1827 – August 14, 1887) was an American journalist, lawyer, politician and diplomat.

In 1878, Sargent historically introduced what would later become the 19th Amendment to the U.S. Constitution, giving women the right to vote.

In January 1878, Senator Sargent introduced the 29 words that would later become the 19th Amendment to the United States Constitution, allowing women the right to vote.

After leaving the Senate he practiced law in San Francisco for three years, leaving to become United States Ambassador to Germany for two years, and held office until German authorities excluded American pork from the German Empire which made his position personally distasteful.

He turned down the appointment of Ambassador to Russia after William H. Hunt's death and made an unsuccessful attempt for the Republican nomination for the Senate in 1885.