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We give a microscopic two dimensional ${\cal N}=(2,2)$ gauge theorydescription of arbitrary M2-branes ending on $N_f$ M5-branes wrapping apunctured Riemann surface. These realize surface operators in four dimensional${\cal N}=2$ field theories. We show that the expectation value of thesesurface operators on the sphere is captured by a Toda CFT correlation functionin the presence of an additional degenerate vertex operator labelled by arepresentation ${\cal R}$ of $SU(N_f)$, which also labels M2-branes ending onM5-branes. We prove that symmetries of Toda CFT correlators provide a geometricrealization of dualities between two dimensional gauge theories, including${\cal N}=(2,2)$ analogues of Seiberg and Kutasov--Schwimmer dualities. As abonus, we find new explicit conformal blocks, braiding matrices, and fusionrules in Toda CFT.

M2-brane surface operators and gauge theory dualities in Toda