We present a measurement of the time dependentCPasymmetries in the decayB0 → &fgr;Ks0using a sample of approximately 120 millionBB¯pairs collected with theBABARdetector at the PEP‐II asymmetric‐energyBmeson factory at SLAC. The values of theCP‐violating parameters derived from a time‐dependent fit to the&fgr;Ks0sample areC&fgr;K= −0.38 ± 0.37 ± 0.12 andS&fgr;K= 0.45 ± 0.43 ± 0.07, where the first uncertainty is statistical and the second systematic. © 2004 American Institute of Physics