DIII

DIII can refer to:


 * Division 3
 * Diablo 3
 * 503 in Roman numerals

Technology

 * DIII-D (tokamak), a tokamak located at San Diego, California.
 * Mercedes D.III

Aircraft

 * Pfalz D.III
 * Albatros D.III
 * Fokker D.III
 * Siemens-Schuckert D.III