Richard Dennis Arnold (August 19, 1808 – July 10, 1876) was an American physician and public servant in Savannah, Georgia, United States. He was the city's mayor for four terms, and was in office during General William Tecumseh Sherman's "March to the Sea". He convinced Sherman to spare Savannah by surrendering the city to President Abraham Lincoln.

Arnold was born in 1808 in Savannah, Georgia, to Captain Richard Arnold and Eliza Dennis.^[1]

He graduated from the College of New Jersey, before attaining an M.D. from University of Pennsylvania Medical School in 1830.^[2]

Arnold was a co-founder of the Georgia Historical Society, the American Medical Association, the Georgia Medical Society and Savannah Medical College. He taught at the latter.^[2]

He served in the Georgia Senate.^[2]

In 1833, he began publishing the Daily Georgian with W. H. Bullock, a role which lasted for a year.^[1]

He was mayor of Savannah on four occasions, including when General Sherman invaded the city. Arnold surrendered the city to Sherman, to avoid the general burning it during his 1864 March to the Sea.^[2]

Arnold married Elizabeth Baugh Stirk.^[2]

Arnold died of tuberculosis in 1876, aged 67, in the same room in which he was born.^[1] He had survived his wife by 26 years, and was buried beside her in Savannah's Bonaventure Cemetery.^[2]