The two spotted spider mite, Tetranychus urticae Koch (Acari: Tetranych- idae) is an important mite pest, which heavily infests apple leaves trees, Malus domestica Borkh in North Sinai, Egypt. Life cycle of spider mite was conducted on the leaves of apple at room temperature ranging from 25-30 ̊C and 60±10% relative humidity. The present study declared that both sexes of the mite passed through four movable stages (larva, protonymph, deutonymph and adult) beside the egg stage. The adult male seemed smaller than the adult female and characterized by its distinctly pointed abdomen. There was a short resting period known as quiescent stage termed as protochrysalis, deuto-chrysalis and tritochrysalis, respectively. The female pre-oviposition, ovi-position and post-oviposition periods were estimated. All developmental stages were mentioned. Mean duration of total immature lasted (5.87±1.37) and (5.91±1.05) day, life cycle was (7.63±1.72) and (7.57±1.29)day, longevity (7.98±2.69) and (2.52±1.22) day, life span was (15.61±1.64) and (10.09±1.08) day for female and male, respectively. The mean number of eggs/female and mean number of eggs/female/day were recorded.