Cygnus Orb-D1, also known as Cygnus 1 and Orbital Sciences COTS Demo Flight, was the first flight of the Cygnus unmanned resupply spacecraft developed by Orbital Sciences Corporation.
Cygnus Orb-D1 alebo tiež Cygnus 1 a Orbital Sciences COTS Demo Flight bol prvý let nepilotovanej nákladnej kozmickej lode Cygnus vyvinutej spoločnosťou Orbital Sciences Corporation (OSC).