“…This study is devoted to the application of the Laguerre collocation method to the numerical solution of the 1‐dimensional parabolic convection‐diffusion equation with the initial conditions and the boundary conditions where f ( x , t ), A ( x ), B ( x ), g ( x ), and h ( t ) are functions defined in [0, l ]×[0, T ]; l and T are appropriate constants. In this study, we develop the Laguerre collocation method given in Gürbüz and Sezer and use to obtain the approximate solution of Equation in the truncated Laguerre series form where a r , s r , s =0,…, N are the unknown Laguerre coefficients and L n ( x ), n =0,1,2,…, N are the Laguerre polynomials defined by …”