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Although most cyanobacteria use visible light (VL; λ = 400–700 nm) for photosynthesis, some have evolved strategies to use far‐red light (FRL; λ = 700–800 nm). These cyanobacteria are defined as far‐red light‐utilizing cyanobacteria (FRLCyano), including two groups: (1) chlorophyll d‐producing Acaryochloris spp. and (2) polyphyletic cyanobacteria that produce chlorophylls d and f in response to FRL. Numerous ecological studies examine pigments, such as chlorophylls d and f, to investigate the presence of FRLCyano in the environment. This method is not ideal because it can only detect FRLCyano that have made chlorophylls d or f. Here we develop a new method, far‐red cyanobacteria identification (FRCI), to identify FRLCyano based on 16S rRNA gene sequences. From public databases and published articles, 62 16S rRNA gene sequences of FRLCyano were extracted. Comparing with related …