scarcity has intensified the use of saline water in irrigated agriculture, compromising the physiological performance and production of crops, particularly okra. Among management strategies, potassium fertilization has stood out as a promising alternative in mitigating the effects of salt stress on plants. The objective was to evaluate the influence of potassium fertilization on gas exchange, chlorophyll a fluorescence, and production components of okra under irrigation with saline water. The experiment was conducted in a randomized block design in a 5 & times; 5 factorial arrangement, with five irrigation water salinity levels (ECw = 0.3, 1.3, 2.3, 3.3, and 4.3 dS m(-1)) and five potassium doses (50, 75, 100, 125, and 150% of the recommended K2O dose), with 100% corresponding to 150 mg K2O kg(-1) of soil, with three replications. Gas exchange, chlorophyll a fluorescence, and production components of okra were evaluated. Salinity levels above 0.3 dS m(-1) reduced the quantum efficiency of photosystem II, fruit length, and fresh fruit weight of okra cv. Santa Cruz. Fertilization with 150% of the recommended K2O dose decreased stomatal conductance, transpiration, and the CO2 assimilation rate of okra irrigated with water of 4.3 dS m(-1). Under semi-arid edaphoclimatic conditions, fertilization with 150% K2O mitigated the effects of salt stress on the fruit diameter of okra irrigated under an ECw of 4.3 dS m(-1).