We will discuss Stochastic Approximation for Banach Valued observation sequences. First part of the talk we will consider Banach space satisfies appropriate geometric conditions. In the second half, we will consider Banach spaces that do not even satisfy Radon-Nikodym (such as L1[0,1] or C[0,1]) and in this case, we prove validity of stochastic approximation under suitable conditions on the error sequence.