The structure of a laminar triple flame is investigated both experimentally and numerically. The distribution oi OH radicals in the flame is mapped using Laser Induced Fluorescence. The structure of the velocity field is mapped using Particle Imaging Velocimetry. To obtain detailed information on both the fields of velocity and scalars, the flame is numerically simulated. In the simulations, gas expansion is taken into account and the full Navier-Stokes equations are solved. Numerical results obtained with global one-step chemistry and, alternatively, with a detailed chemical kinetic mechanism are presented. The experimental findings are compared with the numerical results.