In this paper we investigate the existence of triple positive solutions for the nonlinear third-order three-point boundary value problemwhere δ ∈ (0, 1), η ∈ [1/2, 1) are constants. f : [0, 1] × [0, ∞) × R 2 → [0, ∞), q : (0, 1) → [0, ∞) are continuous. First, Green's function for the associated linear boundary value problem is constructed, and then, by using a fixed-point theorem due to Avery and Peterson, we establish results on the existence of triple positive solutions to the boundary value problem.