Romulan border
The Romulan border may refer to:

 Romulan-Cardassian border, the boundary between the Romulan Empire and Cardassian Union
 Romulan-Klingon border, the boundary between the Romulan and Klingon Empires

See also
 Romulan Neutral Zone, each side of which contains a Federation and Romulan border