This investigation was carried out by Plant Production Department, Faculty of Agriculture (Saba Basha), Alexandria University, Alexandria Egypt, during 2018 and 2019 seasons to study the effect of delaying of sowing dates on yield and yield components of Egyptian cotton varieties Giza 86, Giza 92 and Giza 94, Five late sowing dates were used i.e.: 15th, 28^thApril, 7th, 17^thand 27th May in 2018 season and 15th, 25th April, 8th, 18th and 29th May in 2019 season, respectively. The experiments were conductat Sakha Agriculture Research Station, Agriculture Research Center, Egypt. A split plot design with three replicates were used.  Results showed that the highest mean values were recorded by Giza 94 (A3) for boll weight, number of bolls per plant, seed cotton yield per plant, seed cotton yield per feddan, lint cotton yield per plant, lint cotton yield per feddan, lint percentage and seed index in  2018 and 2019. For sowing dates, the highest mean values were attained from first sowing date (B1) for number of bolls per plant, seed cotton yield per plant, seed cotton yield per feddan, lint cotton yield per plant, lint cotton yield per feddan and seed index in both seasons. In addition there were significant interaction effect between cotton varieties and sowing dater for all studied characters.
The results also cleared that the least affected cultivar by planting dates was (Giza 94) cotton variety and the most affected cultivar by delaying sowing dates for yield and yield component was (Giza 92) cotton variety. From the afore mentioned results, (Giza 94) can be planted in the regions of delayed planting dates.