A bstract We study three-dimensional N $$ mathcal{N} $$ = 2 Spin(7) gauge theories with N ~( S )spinorial matters and with N ~( f )vectorial matters. The quantum Coulomb branch on the moduli space of vacua is one- or two-dimensional depending on the matter contents. For particular values of ( N ~( f ) , N ~( S )), we find s-confinement phases and derive exact superpotentials. The 3d dynamics of Spin(7) is connected to the 4d dynamics via KK-monopoles. Along the Higgs branch of the Spin(7) theories, we obtain 3d N $$ mathcal{N} $$ = 2 G ~(2)or SU(4) theories and some of them lead to new s-confinement phases. As a check of our analysis we compute superconformal indices for these theories.
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