Abstract: In this paper the energies for the four highest occupied molecular orbitals E₁, E₂, E₃ and E₄, and the energy differences ΔE₁ between the HOMO and the LUMO for three types of forked conjugative polyenic compounds have been calculated by the HMO method. The three types of the forked conjugative systems dealt with in this paper have been designated as the amphi-direction-,the bifurcation-, and the concourse-type of compounds, and are exemplified by 2-vinyl-polyenes (A), α-methylene polyenic dicar-bonyl compounds (B), and vinyl polyenyl ketones(C), respectively.