We develop arguments on the critical point theory for locally Lipschitz functionals on Orlicz-Sobolev spaces, along with convexity and compactness techniques to investigate existence of solution of the multivalued equation −∆ Φ u ∈ ∂j(., u) + λh in Ω, where Ω ⊂ R N is a bounded smooth domain, Φ : R −→ [0, ∞) is a suitable N-function, ∆ Φ is the corresponding Φ-Laplacian, λ > 0 is a parameter, h : Ω → R is integrable and ∂j(., u) is the subdifferential of a function j associated with critical growth.Dedicated to Bernhard Ruf on the occasion of his 60 th birthday.