Electronic Journal of Differential Equations, Vol. 2013 (2013), No. 137, pp. 1-7. Title: Generalized Bohl-Perron principle for differential equations with delay in a Banach spaces Author: Michael Gil' (Ben Gurion Univ., of the Negev, Israel) Abstract: We consider a linear homogeneous functional differential equation with delay in a Banach space. It is proved that if the corresponding non-homogeneous equation, with an arbitrary free term bounded on the positive half-line and with the zero initial condition, has a bounded solution, then the considered homogeneous equation is exponentially stable. Submitted February 27, 2013. Published June 20, 2013. Math Subject Classifications: 34K30, 34K06, 34K20. Key Words: Banach space; differential equation with delay; linear equation; exponential stability.