Field experiments were carried out in summer season of 2017 and 2018at the Experimental Farm, Faculty of Environmental Agricultural Sciences, Arish University, North Sinai to study the effect of four irrigation levels (100%, 80%, 60% and 40% of irrigation requirements) on growth and yield of tomato. Seeds of “GS₁₂ F₁" hybrid were sown in plastic speeding trays on 14^th March and transplanting was carried out on 23^rd April. Plants were irrigated using drip irrigation system, the distance between dripper lines centers was 1.2 m. The plot area was 14.4 m² (12 m length and 1.2 m width), the distance between the plants in the same row was 50 cm, planting density was 1.67 plant/m². The highest values of all studied vegetative growth traits, fresh and dry weights, and contents of chlorophyll a, chlorophyll b, and carotenoids were recorded with application of 80% followed by 100% irrigation levels. The highest value for each of grade a, grade b, and total marketable fruit yield per fad., were recorded with the 80% irrigation level in both seasons. The highest unmarketable yield was recorded with the use of the irrigation level of 60%, while the lowest values were recorded with application of 100% or 80% irrigation level.