Saint Bystrík (Latin Beztertus Nitriensis, Bestredius, Bestridus, Bestricus, Bistridus, Bistritus; Hungarian Beszteréd, Besztrik, Besztríd; died 1046) was a martyr and the Bishop of the Diocese of Nitra.

The exact place and time of birth of St. Bystrík is unknown, however he seems to have come from aristocratic family who had been Christianised in the mission of Cyril and Methodius before the end of the Great Moravian Empire in 907 AD.

[5] The disciples of Cyril and Saint Gorazd were spreading out from Zobor at this time and included Astrik, Prokop, Svorad, Benedict and Maurus.

The oldest depiction of the saint dates back to the baroque era and can be found in the a Jesuit publication by Gabriel Hevenesi entitled Ungaricae Sanctitatis Indicia[7] from the year 1692 as Hoffman's copperplate.

Reverence for Saint Bystrík is not very widespread, but there are approximately two dozen of his depictions throughout Slovakia and Hungary, and in Slovak communities in Australia, Canada, Italy, Poland and the United States.

The first surviving historical sources proving his involvement in Nitra are the Annales ecclesiastici regni Hungariae by Melchior Inchofer dating from 1644 AD.