R4 can denote a particular astromech droid type or several distinct astromech droids.
- During the Clone Wars, M5-BZ functioned as a member of D-Squad.
- R4 (Rebel Alliance)
- R4-D6
- R4-E1
- R4-F5
- R4-G77
- After his previous droid was destroyed, R4-G9 became the astromech assigned to Obi-Wan Kenobi.
- R4-I9
- R4-M9
- R4-M1
- R4-P17 , known as Arfour , was an astromech droid serving Obi-Wan Kenobi during the Clone Wars.
- R4-P44
- R9-D9
- R4-D12
- M5-BZ was a D-Squad member who met his end in the Clone Wars.
- R4-A22
- R4-B11
- R4-D1
- R4-D2
- R4-D6
- R4-E1
- R4-F5
- R4-G9 was the second astromech droid to be assigned to Obi-Wan Kenobi.
- R4-H5
- R4-I9
- R4-J1
- R4-J9
- R4-K5
- R4-M1
- R4-M17
- R4-M6
- R4-M9
- R4-P17 , also called Arfour , was the astromech droid that served Obi-Wan Kenobi during the Clone Wars.
- R4-P22 was the astromech droid linked to Anakin Skywalker's starfighter, the Azure Angel.
- R4-P44
- R4-S2
- R4-T8
- R9-D9
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