  Nontrivial topological vacua of non-Abelian gauge symmetry $SU(3)\times
SU(2)_{L}$ of the Standard Model play an important role in baryogenesis. In
particular, the baryon (and lepton) number violation from $SU(2)_{L}$ sphaleron
is a crucial ingredient for baryogenesis at weak scale or higher. In this work,
we point out that generically, a baryon asymmetry is induced by an asymmetry
generated in the new sector through strong $SU(3)$ and/or weak $SU(2)_{L}$
sphaleron portals and vice versa. In the standard radiation-dominated early
Universe, due to phenomenological constraints, the sphaleron portal
baryogenesis has to take place at cosmic temperature $T\gtrsim10^{6}-10^{8}$
GeV together with a $(B-L)$-violating source. As an example, we show an
explicit model where strong sphaleron portal baryogenesis occurs at the scale
of Peccei-Quinn breaking to solve the strong CP problem and this coincides
nicely with the scale where the Weinberg operator responsible for Majorana
neutrino mass is in equilibrium.
