The present investigation aimed to determine genotypic stability for some Egyptian cotton varieties under different environments. Five regional trials were carried out with Egyptian cotton varieties in 1995 and 1996 seasons. Each single trial was grown in a randomized complete block design with four replications. All characters showed highly signifi­cant mean squares for varieties, environments and variety x environ­ment interaction. Average genotypic stability degrees were recorded for seed and lint cotton yield for Giza 86, Giza 87, Giza 88; boll weight for Giza 85 and Giza 87; seed index for Giza 85, Giza 86 and Giza 89; micronaire reading for Giza 88; yarn strength for Giza 86, while all varieties under study were unstable for 2.5% and 50% span length.