The effects of inbreeding in humans on the intelligence has been investigated in the present study of offsprings of second cousin matings (F= 0.0156, n=138 male, 132 female), first cousins once removed (F= 0.03125, n=148 male, 138 female), first cousins (F= 0.0625, n=161 male, 151 female), and unrelated (F= 0, n= 194 male, 182 female) among North Indian Muslims. The Weschler Intelligence Scale for Children (WISC-R)-74 was given to the children in the both groups. An overall significant (p<0.001) reduction of means has been observed in inbred series. The results of this study confirm the appreciable inbreeding depression especially among the offspring of first cousins. Asia Pac J Public
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