Two new Egyptian cotton cultivars and four commercial varieties were evaluated at three locations in North Delta for two successive sea­sons (1995 and 1996). Randomized complete blocks designs were used in all trials. The characters studied were seed cotton yield, lint yield, boll weight, lint percentage, seed index, 2.5%, 50% span length, micronaire reading and yarn strength. Highly significant differences between varie­ties, environments and varieties x environment interaction were obtained for most studied traits. The two newly released varieties Giza 87 and Giza 88 succeeded to compete with extra long staple cultivars in North Delta. Giza 88 produced the highest overall yield, seed index and boll weight. Giza 88 surpassed Giza 45 and Giza 77 in 2.5% span length and exceeded Giza 45 and Giza 70 in yarn strength. Giza 87 surpassed all studied varieties for 2.5%, 50% span length, and yarn strength and sur­passed all varieties except Giza 45 in micronaire reading. Giza 77 pro­duced the lowest lint percentage compared to all varieties.