Mathematics Scientific Journal Vol. 7, No. 2, (2011), 93-103 Numerical solution of Hammerstein Fredholm and Volterra integral equations of the second kind using block pulse functions and collocation method M. M. Shamivand a,∗ , A. Shahsavaran a a Department of Mathematics, Islamic Azad University, Borujerd Branch, Borujerd, Iran. Received 12 June 2011; accepted 11 November 2011 Abstract In this work, we present a numerical method for solving nonlinear Fredholm and Volterra integral equations of the second kind which is based on the use of Block Pulse functions(BPfs) and collocation method. Numerical examples show efficiency of the method. Key words: Hammerstein Fredholm and Volterra integral equations; Block Pulse functions; Collocation method. ∗ Corresponding author Email address: m.shamivand@yahoo.com (M. M. Shamivand).