| Court Type: | circuit |
| Court Name: | United States Court of Appeals for the First Circuit |
| Abbreviation: | 1st Cir. |
| Seal: | Seal of the United States Court of Appeals for the First Circuit.svg |
| Seal Size: | 150 |
| Map Image Name: | File:1st Circuit map.svg |
| Courthouse: | John Joseph Moakley U.S. Courthouse |
| Location: | Boston, Massachusetts |
| Appeals From: | District of Maine |
| Appeals From1: | District of Massachusetts |
| Appeals From2: | District of New Hampshire |
| Appeals From3: | District of Puerto Rico |
| Appeals From4: | District of Rhode Island |
| Established: | June 16, 1891 |
| Circuit Justice: | Ketanji Brown Jackson |
| Chief: | David J. Barron |
| Judges Assigned: | 6 |
The United States Court of Appeals for the First Circuit (in case citations, 1st Cir.) is a federal court with appellate jurisdiction over the district courts in the following districts:
The court is based at the John Joseph Moakley Federal Courthouse in Boston, Massachusetts. Most sittings are held in Boston, where the court usually sits for one week most months of the year; in one of July or August, it takes a summer break and does not sit. The First Circuit also sits for one week each March and November at the Jose V. Toledo Federal Building and United States Courthouse in Old San Juan, Puerto Rico, and occasionally sits at other locations within the circuit.[1]
With six active judges and four active senior judges, the First Circuit has the fewest judges of any of the thirteen United States courts of appeals. It covers most of New England, as well as Puerto Rico. Since retiring from the United States Supreme Court, Associate Justice David Souter has occasionally sat on the First Circuit by designation.