We investigate the analogue of S-duality for 2-d gravity. Our analysis is b
ased in a partition function associated to the Katanaev-Volovich type actio
n for 2-d gravity. We find a S-dual 2-d gravitational action which is relat
ed to the original 2-d gravitational action by strong-weak duality transfor
mation. (C) 2001 Elsevier Science B.V. All rights reserved.