The coefficients of thermal expansion, , of uni-directional and bi-directional glass reinforced composites are reported for the temperature range 20-150°C. Composite thermal expansion is shown to be highly anisotropic. An analytical procedure to predict laminate coefficient of thermal expansion based on micromechanics lamination theory from the literature is also included. Finally, the experimental results have been compared with the values obtained by using the model. It is shown that calculated values of thermal expansion are in close agreement with those measured.