A strip-plot experiment was carried out during the two winter seasons of 2018/2019 and 2019/2020 at a private farm located in Demiana village, Belqas District, Dakahlia Governorate, Egypt. This study aimed to investigate the impact irrigation water levels and some potassium forms on garlic (cv. Balady) vegetative growth, water relations and leaves pigments, bulbs physical and chemical quality as well as yield and its components. Irrigation water level treatments were 50%, 75% and 100% full irrigation and different potassium forms (without, potassium citrate, potassium nitrate and potassium thiosulfate) at concentration of 1000 ppm as foliar spray. Results showed that all studied traits of garlic were significantly decreased with water irrigation deficit except electorate leakage, leaves and cloves dry matter, net ratio percentage, water use efficiency for fresh and cured yield and loss weight percent were improved. The highest values of all characters were achieved by potassium thiosulfate. However, the best values for leaves and cloves dry matter and loss weight percentage exhibited by potassium citrate. In addition, the most promising results were obtained from garlic plants treated with potassium thiosulfate interacted with full irrigation treatment which followed by the interaction treatment of full irrigation level with potassium citrate. It can be recommend treating garlic plants with potassium thiosulfate (1000 ppm) to improve yield and water use efficiency. As well as, potassium citrate (1000 ppm) to increase cloves dry matter and eliminate weight loss of cured yield of garlic bulbs under different irrigation levels.