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We present a direct measurement of trilinear gauge boson couplings at γWW and ZWW vertices in WW and WZ events produced in pp collisions at √s= 1.96 TeV. We consider events with one electron or muon, missing transverse energy, and at least two jets. The data were collected using the D0 detector and correspond to 1.1 fb-1 of integrated luminosity. Considering two different relations between the couplings at the γWW and ZWW vertices, we measure these couplings at 68% C.L. to be κγ = 1.07+0.26-0.29, λ = 0.00-0.06+0.06, and g1Z = 1.04-0.09+0.09 in a scenario respecting SU(2)L gauge symmetry and κ = 1.04+0.11-0.11 and λ = 0.0+0.06=0.06 in an “equal couplings” scenario.