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DH Cephei is a prominent O+O-type binary system in the NGC 7380 open cluster.Our high-precision multi-band polarimetry demonstrates synchronous linearpolarization variations with the orbital period. Using Stokes parameters, wederived the binary system's orbital inclination, orientation, and rotationdirection. To estimate interstellar polarization, we observed neighboring starsin NGC 7380. Utilizing Dipol-2 polarimeter and T60 telescope, we measuredlinear polarization in the $B$, $V$, and $R$ bands with $\sim$0.003% accuracy.Lomb-Scargle period search revealed a dominant frequency at 1.055 d,corresponding to half of the 2.11 d orbital period. The $B$ passband showed anon-periodic component, while the $V$ passband provided reliable values forinclination ($46^{\circ}+11^{\circ}/-46^{\circ}$) and orbital orientation($\Omega = 105^{\circ} \pm 55^{\circ}$). Using these values, we estimated amass loss of $\sim$$3.4 \times 10^{-7}M_{\rm \odot} ; \rm yr^{-1}$. The binarysystem's rotation on the sky is clockwise. Polarimetric observations ofneighboring stars indicate interstellar dust causing cluster star polarization.

High-precision broadband linear polarimetry of early-type binaries IV. Binary system of DH Cephei in the open cluster of NGC 7380