  We present optical R-band light curves of the double gravitationally lensed
quasar FBQ 0951+2635 from observations obtained at the Nordic Optical Telescope
between March 1999 and June 2001. A time delay of 16 +/- 2 days (1 sigma) is
determined from the light curves. New constraints on the lensing geometry are
provided by the position and ellipticity of the lensing galaxy. For a (Omega_m,
Omega_Lambda) = (0.3, 0.7) cosmology, the time delay yields a Hubble parameter
of H_0 = 60^{+9}_{-7} (random, 1 sigma) +/- 2 (systematic) km/s/Mpc for a
singular isothermal ellipsoid model and H_0 = 63^{+9}_{-7} (random, 1 sigma)
+/- 1 (systematic) km/s/Mpc for a constant mass-to-light ratio model. In both
models, the errors are mainly due to the time-delay uncertainties.
Non-parametric models yield H_0 = 64^{+9}_{-7} (random, 1 sigma) +/- 14
(systematic) km/s/Mpc.
