PRA Health Sciences was a contract research organization (CRO) with headquarters in Raleigh, North Carolina.

PRA was founded as the Anti-Inflammatory Drug Study Group in 1976, renamed PRA in 1982, as it expanded into other therapeutic areas besides inflammation.

[2] In 2013 the company was acquired by Kohlberg Kravis Roberts, which brought the company public in November 2014 and maintained shares until September 2019.

[3] In August 2017, the company acquired Conshohocken-based real-world healthcare data, analytics, and technology solutions company Symphony Health for US$530 million.

[5] PRA was acquired by ICON PLC on 1 July 2021.