Bulk superconductivity was observed in the new system (InxPb0.75−xCu0.25)Sr2(Ca0.5Y0.5)Cu2O7−&dgr;. An increase in indium doping, 0≤x≤0.2, into the Pb sites results in an increase in the superconducting transition temperatureTcfrom 45 K forx=0 to 60 K forx=0.2. For nominal compositionsx≳0.2, a decrease inTcwas observed, and an increase in the concentration of an impurity phase. From the results of the x‐ray diffraction and energy‐ dispersive spectrometry, we identify the phase responsible for the superconductivity to be [In0.06(1)Pb0.69(1)Cu0.25]Sr1.99(7)[Ca0.47(1)Y0.53(2)]Cu2O7−&dgr;; this phase resulted from the synthesis of a sample of nominal composition (In0.2Pb0.55Cu0.25)Sr2(Ca0.5Y0.5)Cu2O7−&dgr;.