Robert of Selby (or Salebia) (died 1152) was an Englishman, a courtier of Roger II and chancellor of the Kingdom of Sicily.
With the cause hopeless, Robert advised the city to surrender and beg imperial protection to prevent a sack by the eager Pisans.
In 1143, when Pope Innocent II refused to recognise the Treaty of Mignano, Robert of Selby marched on papal Benevento.
According to John of Hexham, writing in 1147, Robert was "the most influential of the King's friends, a man of great wealth and loaded with honours."
An incident in the Policraticus, records Robert negotiating three large bribes from three candidates for the vacant see of Avella—and promptly disclosing the simony to an assembly of bishops, who elected a worthy abbot instead.