Conway Hillyer Arnold, USN, (November 14, 1848 – July 16, 1917) was a rear admiral of the United States Navy, in command of the Third Squadron of the Atlantic Fleet in 1910.

He was born on November 14, 1848, in New York to Commander Henry Nathan Tewkesbury and Cornelia Van Vleck Sleight.

Then, by 1908, he was promoted to the position of rear admiral and placed in charge of the Third Squadron of the Atlantic Fleet On November 17, 1870, he married Fannie Wood of Raleigh, North Carolina, daughter of William W. W. Wood, Engineer in Chief of the United States Navy.

[1] His son Conway Hillyer Arnold Jr., who also served with distinction in the military, died at a young age on April 6, 1908[2] in Denver, Colorado, possibly of tuberculosis.

Admiral Arnold was a companion of the Military Order of the Loyal Legion of the United States and a member of the Society of the Cincinnati.