Reginar Longneck or Reginar I, Latin: Rainerus or Ragenerus Longicollus, was a leading nobleman in the kingdom of Lotharingia, variously described in contemporary sources with the titles of count, margrave, missus dominicus and duke. He stands at the head of a Lotharingian dynasty known to modern scholarship as the Reginarids, because of their frequent use of the name "Reginar".
- Occupation
- Catholic priest
- Position held
- abbot of Echternach
- Born
- 850
- Died
- 915
