AbstractWe study some properties of bounded and C (1) -almost automor-phic solutions of the following Li´enard equation:x 00 +f(x)x 0 +g(x) = p(t),where p : R −→ R is an almost automorphic function, f, g : (a,b) −→R are continuous functions and g is strictly decreasing.AMS classification: 34C11, 34C27, 34D05.Key words: Almost automorphic solutions, bounded solutions, Li´e-nard equations. 1 Introduction In this paper, we study some properties of bounded or C (1) -almost automor-phic solutions of the following Li´enard equation:x 00 +f(x)x 0 +g(x) = p(t), (1.1)where p: R −→ R is an almost automorphic function and f,g: (a,b) → R,(−∞ ≤ a 0 and p: R −→ R is an almost automorphic function, thatappears when the restoring force is a singular nonlinearity which becomesinfinite atzero. Mart´inez-Amores andTorres in [13], then Campos and Torresin [5] describe the dynamics of Equation (1.1) in the periodic case, namelythe forcing term pis periodic. Recall that the existence of periodic solutionsof Equation (1.1) without friction term (f = 0) is proved by Lazer andSolimini in [12] and by Habets and Sanchez in [11] for some Li´enard equationsEJQTDE, 2008 No. 21, p. 2