The present work was developed with the objetive of evaluating pregerminating treatments in lettuce seeds, such osmotic conditioning with and without drying and gibberellic acid. Seeds of Hortência cultivar which were conditioned in solution of polyethylene glycol 6000 (PEG 6000), in the concentration of 250g/l, establishing the potential osmotic of -0.80MPa. The same ones were maintained by periods of zero, 24, 48, 72, 96 e 120 hours, to the constant temperature of 20°C. After the osmotic conditioning, the effect of the artificial drying was evaluated, to the 32°C for four hours, in the seeds. Were used for the treatment with gibberellic acid the following concentrations: zero, 50, 100, 200, 400, 500, 600, 700, 800 and 1000ppm. The gibberellic acid was used as solution to humidify the paper filter during the test of germination. The parameters used to evaluate the treatments were: germination test, first couting of the germination test and seedling length. The results allowed to conclude that: the pregerminating treatment of osmotic conditioning in the conditions of potential of -0.80MPa and in the temperature of 20ºC,with period of soaking of 96 hour, affects the physiologic quality of the lettuce seeds by increasing the seedling length of lettuce. The drying after the osmotic conditioning for 96 hours of soaking maintains the germination and reduces the length of lettuce seedling. The pregerminating treatment with gibberellic acid does not affect the germination and increases the length of the seedling, but after 500ppm occur etiolation in seedlings.