Aaron Nielson

Aaron Nielson
Aaron Nielson arguing Collins v. Yellen
9th Solicitor General of Texas
In office
November 13, 2023 – July 7, 2025
Appointed byKen Paxton
GovernorGreg Abbott
Preceded byJudd Stone
Succeeded byWilliam R. Peterson
Personal details
Born1980 (age 45–46)
EducationUniversity of Pennsylvania (BA)
Trinity Hall, Cambridge (LLM)
Harvard University (JD)

Aaron Lloyd Nielson (born 1980) is an American lawyer and legal scholar who served as the solicitor general of Texas from 2023 to 2025. He is a professor of law at Brigham Young University (BYU) and an expert on the Administrative Procedure Act. In 2020, he was appointed by the U.S. Supreme Court to argue the case Collins v. Yellen (2021).