Electronic Journal of Differential Equations, Vol. 2009(2009), No. 05, pp. 1-12. Title: $\Psi$-bounded solutions for linear differential systems with Lebesgue $\Psi$-integrable functions on $\mathbb{R}$ as right-hand sides Author: Aurel Diamandescu (Univ. of Craiova, Romania) Abstract: In this paper we give a characterization for the existence of $\Psi$-bounded solutions on $\mathbb{R}$ for the system $x'=A(t)x + f(t)$, assuming that $f$ is a Lebesgue $\Psi$-integrable function on $\mathbb{R}$. In addition, we give a result in connection with the asymptotic behavior of the $\Psi$-bounded solutions of this system. Submitted October 9, 2008. Published January 06, 2009. Math Subject Classifications: 34D05, 34C11. Key Words: $\Psi$-bounded; $\Psi$-integrable.