Despite several examples of single-stranded Möbius molecules, double-stranded aromatic molecules with Möbius topology still remain limited due to the difficulties associated with their synthesis. As shown in Fig. , saturated linkers (-CH2O-) or chalcogen atom linkers (-S-) are necessary to reduce the strain caused by the Möbius topology (Fig. , center and right) . Even though Möbius-type CNBs have been theoretically proposed since the 1990s , a synthetic methodology to introduce Möbius topology to fully fused and fully conjugated all-sp 2 carbon structures still remains to be developed in molecular nanocarbon science. Herein, we report the synthesis, isolation, and optical analysis of a Möbius carbon nanobelt (MCNB), i.e., a fully fused carbon nanobelt with a twist. The key to the synthesis of such MCNBs is a modification of our previously reported synthetic strategy for CNBs . As shown in Fig. )CNBs (n = 6, 8, and 12, where (n,n) is the chiral index of the corresponding CNTs) were synthesized via a reductive homocoupling reaction using cyclic molecules that consist of dibromoparaphenylene and cis-ethenylene precursors . The important feature of this method is that a CNB can be generated when the number of repeat units is even, whereas an MCNB can be obtained when the number is odd. This is a simple but powerful method for the synthesis of a complex Möbius topology from highly symmetric precursors.