JPJ or J.P.J. may refer to:
- The Malaysian Road Transport Department (Jabatan Pengangkutan Jalan Malaysia), commonly abbreviated as "JPJ"
- John Paul Jones, a British sailor known for his service in the American and Russian navies
- John Paul Jones, British musician, songwriter, arranger associated with Led Zeppelin
- John Paul Jones Arena (also known as JPJ Arena), an arena in Charlottesville, Virginia named after the father of Paul Tudor Jones
- USS John Paul Jones, the name of several United States Navy vessels