Objectives: This study seeks to understand how national origin and legal migration status of noncitizen defendants in federal criminal courts shape incarceration and sentence length decisions. Method: The authors use annual United States Sentencing Commission (USSC) Monitoring of Federal Criminal Sentences (MFCS) datasets (2011–2016) to examine the impact of defendant’s (1) national origin and (2) legal versus illegal migration status on incarceration and sentence length decisions in federal criminal courts. In addition, in order to account for effects of immigration cases, supplemental analyses are conducted for (1) non-immigration offenses and (2) immigration-only offenses. Results: For the incarceration decision, noncitizen defendants have higher odds of incarceration than U.S. citizens, net of other factors. These effects are less consistent in the sentence length decision. These relationships systemically differ across national origin and legal migration status. Conclusions: Punishment disadvantages based on one’s citizenship are particularly pronounced for defendants from Mexico, Latin America, and Africa and especially for those with “illegal” migration status. As noncitizen populations continue to grow in federal courts and in the U.S. more broadly, understanding and addressing these citizenship disparities in punishment will be increasingly important.