We find that first‐order thermodynamic perturbation theory (TPT1) which incorporates the reference monomer fluid used in the generalized Flory–AB (GF–AB) theory yields an equation of state for fused hard‐sphere (FHS) chain fluids that has accuracy comparable to the GF–AB and GF–dimer–AC theories. The new TPT1 equation of state is significantly more accurate than other extensions of the TPT1 theory to FHS chain fluids. The TPT1 is also extended to two‐dimensional fused hard‐disk chain fluids. For the fused hard‐disk dimer fluid, the extended TPT1 equation of state is found to be more accurate than the Boublík hard‐disk dimer equation of state.
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