Nicholas Jon Ganjei (born 1979) is a United States District Judge for the United States District Court for the Southern District of Texas. He previously served as United States Attorney for the Southern District of Texas from January 2025 to March 2026.

- Gender
- Male
- Race
- White
Prior employment
U.S. attorney for the Southern District of Texas2025–2026- U.S. Sen. Ted Cruz of TexasChief counsel · 2022–2025
Eastern District of TexasAssistant U.S. attorney · 2020–2022- ↳first assistant U.S. attorney · 2020–2021
- ↳acting U.S. attorney · 2021
District of New MexicoAssistant U.S. attorney · 2008–2020
Office of Legal Policy, U.S. Department of Justice (on detail)Counsel · 2018–2019
Adjunct professor and lecturer · 2012–2018
Law clerk , Hon. Richard Allen Griffin · 2007–2008
Law clerk , Hon. Ralph R. Erickson · 2005–2007
Adjunct professor · 2007
Appointments
2026–present · Appointed by Donald J. Trump (Republican)
Education
- University of California, Berkeley, School of LawJ.D. · 2005
- American UniversityB.A. · 2000