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In this paper we are concerned with the oscillation of third order nonlinear delay differential equations of the form $${\left(r_2\left(t\right){\left(r_1\left(t\right)x^{\text{'}}\right)}^{\text{'}}\right)}^{\text{'}}+p\left(t\right)x^{\text{'}}+q\left(t\right)f\left(x\left(g\left(t\right)\right)\right)=0.$$ We establish some new sufficient conditions which insure that every solution of this equation either oscillates or converges to zero.