Heather Ann O'Reilly (born January 2, 1985) is an American professional women's soccer player who plays as a midfielder.

On October 27, 2019, she played her final match for the North Carolina Courage before retiring, winning the 2019 NWSL championship.

20 jersey was retired by the program, joining athletes April Heinrichs, Lorrie Fair, Tisha Venturini, Kristine Lilly and Mia Hamm, along with 13 others.

[citation needed] O'Reilly was allocated to Sky Blue FC of Women's Professional Soccer on September 16, 2008, along with fellow U.S. national team players Natasha Kai and Christie Rampone.

[11] She appeared in 17 matches as co-captain during the 2009 inaugural season, leading Sky Blue to an unexpected playoff berth.

[citation needed] Following her husband's enrollment in Harvard Business School, O'Reilly trained with and played two matches with the Boston Breakers of the Women's Premier Soccer League Elite in 2012 after the WPS folded and during breaks with her national team duties.

[citation needed] On October 27, 2014, FC Kansas City announced that it had acquired O'Reilly in a trade that sent Morgan Marlborough and Kassey Kallman to the Breakers.

[16] North Carolina participated in the 2018 Women's International Champions Cup, O'Reilly started in the Championship Game and scored a goal in the 10th minute.

[17] On April 12, 2019, O'Reilly announced via social media that she would retire from professional soccer at the conclusion of the 2019 NWSL Season.

During her participation at Soccer Aid 2022, Arsène Wenger had suggested O'Reilly continue her playing career, which prompted her to look for a suitable UWCL club.

[20][21] On August 18, 2022, O'Reilly started for Shelbourne in their UEFA Women's Champions League qualifier against Slovenian side Pomurje.

"[23] O'Reilly joined back up with Shelbourne in October 2022,[24] returning to action in the side's 2-0 victory against Sligo Rovers.

[27] O'Reilly was rostered for the NC Courage U23 again in 2024, coming into play as a substitute during the team's 3–0 playoff win over the Long Island Rough Riders.

[28] O'Reilly signed a one-day contract with NJ/NY Gotham FC for a friendly game against Chelsea on August 19, 2024, but did not make the matchday roster after not passing her physical.

O'Reilly made her first appearance with the United States women's national soccer team on March 1, 2002, against Sweden.

[31] After recovering from a broken fibula from a match the year before, O'Reilly made the national team roster for the 2004 Summer Olympics in Athens.

In the 2007 FIFA Women's World Cup, O'Reilly scored a critical goal against North Korea in the 69th minute, which tied the match at 2–2 and saved the Americans from a devastating opening-round loss.

[35] O'Reilly was selected for the 2011 FIFA Women's World Cup and in the second match of the group stage scored the first of three goals for USA against Colombia.

To some controversy, she was left off the team by Jill Ellis and made an alternate for the 2016 Rio Olympics even with having the most caps of the squad at the time (229).

[39] She retired on September 15 after a friendly match against Thailand, held in Columbus, Ohio,[39] after the USWNT scored 9 goals.