The ternary Cr(III) sulfide La15.9(2)Cr5.4(2)S32 contains d3-d3 face-shared bioctahedral Cr2S9
12- dimers (d
Cr
-
Cr = 3.014(5) Å) alternately linked by two types of edge-bridged octahedral cluster units (La6S13 and La3.9Cr1.4S13) to form chains running parallel to the c-axis. Its oxidation state, structure, composition, and magnetism are discussed in terms of previous literature reports.