A portable cigar ashtray for use in a cup holder of a vehicle includes a shell that has a bottom. A wall is coupled to and extends upwardly from the bottom. The wall has an upper perimeter defining a top of the shell, which is open. A rim that is complementary to the upper perimeter is coupled to the upper perimeter. A plurality of retainers is coupled to the rim. A blade is coupled to the rim. The shell is configured to insert into a cup holder. The retainers are positioned on the rim and are configured to maintain a lit end of a cigar in position over the top of the shell. The blade is positioned on the rim and is configured to cut off a head end of the cigar.