Rabban Bar Ṣawma, also known as Rabban Ṣawma or Rabban Çauma, was a Uyghur monk turned diplomat of the "Nestorian" Church of the East in China. He is known for embarking on a pilgrimage from Yuan China to Jerusalem with one of his students, Markos. Due to military unrest along the way, they never reached their destination, but instead spent many years in Ilkhanate-controlled Baghdad.