PurposeUsing a generalized translation operator, this study aims to obtain a generalization of Titchmarsh's theorem for the Laguerre–Bessel transform for functions satisfying the ψ-Laguerre–Bessel–Lipschitz condition in the space L2α (K), where K=0,+∞×0,+∞[.Design/methodology/approachThe author has employed the results developed by Titchmarsh, of reference number [1].FindingsIn this paper, an analogous of Titchmarsh's theorem is established for Laguerre–Bessel transform.Originality/valueTo the best of the authors’ findings, at the time of submission of this paper, the results reported are new and interesting.