Grain growth behaviour of the Al-Cu eutectic alloy was investigated as a function of strain (ε), strain rate {Mathematical expression} and deformation temperature (T) over {Mathematical expression} = 10-2 s-1 and T=400 to 540°C. The grain size increases with increase in strain and temperature. Upon deformation to a fixed strain, the grain growth is generally seen to be more at lower strain rates. The rates of overall grain growth {Mathematical expression} and due to deformation alone {Mathematical expression}, however, increase with increasing strain rate according to {Mathematical expression} and {Mathematical expression}, respectively. The increase in the grain growth rate with strain rate is attributed primarily to the shorter time involved at higher strain rate for reaching a fixed strain. The activation energy for grain growth under superplastic conditions is estimated to be 79 kJ mol-1. © 1991 Chapman & Hall.