S4 (disambiguation)

S4 may refer to the following:

Canon

• Essfour, an R5 series astromech droid of the Rebellion

Legends

• S4-C8-GE3, a GE3-series protocol droid who operated on Nar Shaddaa
• S4-E Support Droid, a probe droid of the Order of Revan
• The S40K Phoenix Hawk-class light pinnace, the Firespray-31-class patrol and attack craft's predecessor
• The Kubrai-class S4 transport, an expensive transport ship by Kubrai Transportation

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