M. A. Attia, H. M. A. Elsayed, I. M. A. Bedawy Safflower, cluster analysis, correlation coefficient, variability, oil 73-82 8(3) 2024 July 2024 This study aims to study genetic variability, correlation, and cluster analysis and evaluate 15 safflower (Carthamus tinctorius L.) genotypes during 2021 and 2022 at Shandaweel Research Station, Agricultural Research Center, Egypt. Highly significant differences were found for all studied traits. Nine lines had means of total plot yield trait higher than the two check varieties. Six lines exceeded the two check varieties and the general mean for oil % trait, and there were Line 83, 91, 97, 100, and line 103. The phenotypic coefficient of variation (PCV) values ranged from 1.91% for the total plot yield to 73.84% for seed yield/plant in the first season. Genotypic coefficient of variation (GCV) values in this season were ranged from 1.71% for the total plot yield trait to 65.20% for the oil percentage trait. PCV values ranged from 2.53% for the total plot yield trait to 67.0% for seed yield/plant trait in the second season. While second seasons GCV values ranged from 2.53% for total plot seed to 61.99% for oil percentage trait. Heritability in broad sense estimations was high for all traits and ranged from 79.54% for seed yield per plant to 99.93% for oil percentage in the first season and 85.15% for seed yield per plant 99.97% for oil percentage in the second seasons. The cluster analysis showed fifteen safflower genotypes were divided into four groups. Positive and significant phenotypic and genotypic correlation recorded between seed yield/plant trait and plant height.