Pyrolysis-hydrogenation-gas chromatography (PHGC) was applied to determine the branches in ethylene-1-butene-α-olefin terpolymers, where α-olefin was 1-decene, 1-dodecene, or 1-hexadecene. The polymers were prepared by using Ziegler-Natta catalysts in n-heptane suspension. Each branch type was identified from the characteristic methylalkane peak caused by β-scission of the branched carbon. Quantitative determinations were done by using ethylene-α-olefin copolymers as reference. Octyl, decyl, and tetradecyl branches were identified from the pyrograms. Branch contents determined by the PHGC technique were compared with those obtained by IR and 13C NMR spectroscopy. Few scissions were observed in the branches of the copolymers.