Abstract: Adjustably positionable airbag assemblies and associated systems and methods are described herein. An occupant restraint system configured in accordance with embodiments of the present technology can include, for example, an airbag stowed and carried on a seat belt web of the occupant restraint system in an aircraft. The occupant restraint system can further include a fastening assembly configured to receive a web of the occupant restraint system. In a first mode, the fastening assembly is slidable along at least a portion of the web. In a second mode, the fastening assembly is coupled to the airbag and secured (e.g., clamped) to the web in a selected position. The airbag is configured to inflate in response to a rapid deceleration event and deploy in front of a seat occupant.