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We derive the off-shell nilpotent symmetries of the two (1+1)-dimensional(2D) non-Abelian 1-form gauge theory by using the theoretical techniques of thegeometrical superfield approach to Becchi-Rouet-Stora-Tyutin (BRST) formalism.For this purpose, we exploit the augmented version of superfield approach(AVSA) and derive theoretically useful nilpotent (anti-)BRST, (anti-)co-BRSTsymmetries and Curci-Ferrari (CF) type restrictions for the self-interacting 2Dnon-Abelian 1-form gauge theory (where there is no interaction with matterfields). The derivation of the (anti-)co-BRST symmetries and all possibleCF-type restrictions are completely novel results within the framework of AVSAto BRST formalism where the ordinary 2D non-Abelian theory is generalized ontoan appropriately chosen (2, 2)-dimensional supermanifold. The latter isparameterized by the superspace coordinates Z^{M} = (x^{\mu}, \theta,\bar\theta) where x^{\mu } (with \mu = 0,1) are the bosonic coordinates and apair of Grassmannian variables (\theta, \bar\theta) obey the relationships:\theta^{2} = \bar\theta^{2} = 0, \theta\bar\theta + \bar\theta\theta = 0.

Nilpotent Symmetries and Curci-Ferrari Type Restrictions in 2D Non-Abelian Gauge Theory: Superfield Approach