In cyanobacteria and chloroplasts, chlorophyll a (Chl a) is not always the single type of Chl used in oxygenic photosynthesis. Rather, there is a series of non-a Chls, namely, b-type Chls, c-type Chls, Chl d, and Chl f. Plenty of reviews published over the past decades commented on these Chls in chloroplasts while only few analogously dealt with cyanobacteria. The review article takes an effort to span the gap. Cyanobacterial b-type and c-type Chls are exclusively antenna pigments; they absorb near-red and blue light, respectively, and facilitate waste-less energy input to reaction centers. Chl d and possibly Chl f partake in both antennae and reaction centers; they empower constitutive usage of far-red light or participate in the adaptive mechanism of far-red light photoacclimation.