R4

R4 can refer to either a specific astromech droid model or one of several individual astromech droids.

Droid models

 * R4-series agromech droid
 * R4-P-series astromech droid

Individual droids

 * R4-A22
 * R4-B11
 * R4-D1
 * R4-D2
 * R4-D6
 * R4-E1
 * R4-F5
 * R4-G4
 * R4-G9
 * R4-H5
 * R4-I9
 * R4-J1
 * R4-J9
 * R4-K5
 * R4-M17
 * R4-M6
 * R4-M9
 * R4-M9 (Star Tours)
 * R4-P17
 * R4-P44
 * R4-S2
 * Unidentified R4 unit (Star Tours)