Adoption of transgenic cotton varieties that contain Bollgard and/or Roundup Ready has been rapid in the U.S. Some areas of the U.S. have had lower than normal fiber quality in recent years. Questions have been raised regarding the fiber quality of transgenic varieties compared to their recurrent parents. Two general sources of data exist for comparing fiber quality of transgenic and their parent varieties. All potential transgenic varieties are compared against the recurrent parent in small plot replicated trials prior to commercialization. The comparisons also exist in some large scale grower plots. Summary results are reported for seven families of Deltapine varieties grown in small plot replicated trials and for four families of Deltapine varieties grown in large grower plots. Fiber staple length, fiber strength, and micronaire are reported by variety contrast as well as over varieties for gene contrasts for both small and large plots. Some differences in fiber quality exist between transgenic varieties and their recurrent parents. Differences are of minor magnitude and not consistent across variety families for the specific gene traits. Any differences represent the the influence of plant selection in a breeding program. Varieties developed using the backcross method are similar to the parent variety, but not always identical.