Jared Donaldson (born October 9, 1996) is an American former professional tennis player from Glocester, Rhode Island. Donaldson was the only American to qualify for the inaugural Next Generation ATP Finals at the end of 2017 as the fifth seed. He has won a Challenger title in singles as well as doubles, with both of them having come at the Royal Lahaina Challenger in 2015.

Donaldson trained on the red clay in Buenos Aires for two years instead of following the conventional route of joining a tennis academy or USTA Player Development. His time there dramatically improved his consistency, movement and mental game. Having never claimed any prestigious junior crowns (Orange Bowl, Junior Grand Slams, Les Petits), Donaldson reached the final of the 2013 USTA Boys 18s National Championship at the age of 16, where he lost to Collin Altamirano in straight sets. Donaldson also attended the Gordon School and played middle school tennis there.

At the 2013 US Open, Donaldson reached the final round of qualifying, beating two players in the Top 250.

He continued to play extensively in the Turkey and US Futures circuit until breaking through with three consecutive Futures titles in June 2014. Donaldson then qualified for his first ATP event in Washington, D.C. at the Citi Open. He made an official statement about turning pro instead of playing collegiate tennis on August 22, 2014, just short of his 18th birthday.

He received main draw wildcards into the singles and doubles tournaments at the 2014 US Open. Although he lost to Gaël Monfils in straight sets, he received high praise from many of the tennis elite.

In January 2015, he won his first Challenger title at the 2015 Royal Lahaina Challenger in Maui, allowing him to move into the top 200 of the ATP rankings. He also won the doubles title in Maui with partner Stefan Kozlov. The following month, he won his first ATP level match at the 2015 Memphis Open, this time defeating Kozlov.

Donaldson made it through qualifying at the US Open. He then recorded the biggest win of his career, knocking off 12th-seeded David Goffin in the first round. He then beat Viktor Troicki before losing to Ivo Karlović in the third round, which was enough to push him into the top 100 of the ATP rankings for the first time.

With a higher ranking and consistent success, Donaldson was able to play primarily in ATP Tour level events throughout the year. He solidified his position in the Top 100 by reaching the fourth round of the Miami Open as a qualifier, rising from No. 95 to No. 73 in the ATP rankings. After a relatively quiet clay court season, Donaldson continued his climb in the rankings by making it to the third round at Wimbledon. Later in the summer, he scored two of the biggest wins of his career over No. 18 Lucas Pouille and No. 14 Roberto Bautista Agut in the first round at the 2017 Canada Open and 2017 Cincinnati Masters respectively, where in the latter he reached the quarterfinals at a Masters level event for the first time. These two successful runs helped to catapult Donaldson to a then career high ATP ranking of No. 50 in the world on 23 October 2017.