A novel soybean cultivar, designated 0509252, is disclosed. The invention relates to the seeds of soybean cultivar 0509252, to the plants of soybean 0509252 and to methods for producing a soybean plant produced by crossing the cultivar 0509252 with itself or another soybean variety. The invention further relates to hybrid soybean seeds and plants produced by crossing the cultivar 0509252 with another soybean cultivar.