Cbet nr. 3012, issued on 2012, February 04, announces the discovery of a new comet (discovery magnitude 18.3) on CCD images taken with the 0.45-m f/2.8 reflector at La Sagra, Spain on January 29.1, 2012. The apparently asteroidal object was later noted by Jaime Nomen on La Sagra images taken on Jan. 30.2 to be a possible comet with slight diffuseness. The new comet has been designated C/2012 B3 (LA SAGRA).