Pellegrinus I[a] (died 8 August 1161), also called Pilgrim of Ortenburg,[1] was Patriarch of Aquileia in northern Italy from 1130 to 1161.

[4] He was a faithful supporter of the emperors Conrad III and Frederick Barbarossa during their struggle against Rome.

[2] He reached an agreement of "peace and friendship" (pax et amicitia) with Archbishop Conrad I of Salzburg (died 1147) whereby the latter agreed to pay tithes to Aquileia for those properties which the archdiocese held in the patriarchate.

[5] In 1150 he came into conflict with Engelberto, from the family of the Counts of Gorizia, who laid a claim against the assets of the church of Aquileia.

[5] He was a leading figure in the synod of Pavia in 1160, where the Antipope Victor IV was recognized by some of the Cardinals, with the support of the imperial legate.