A planetary gear train of an automatic transmission for a vehicle may include an input shaft, an output shaft, a first planetary gear set including first, second, and third rotation elements, a second planetary gear set including fourth, fifth, and sixth rotation elements, a third planetary gear set including seventh, eighth, and ninth rotation element, and a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements, in which the input shaft is directly connected to the third rotation element, the second rotation element is directly connected to the eleventh rotation element, the output shaft is directly connected to the second rotation element, the third rotation element is directly connected to the fourth rotation element, the sixth rotation element is directly connected to the eighth rotation element, the ninth rotation element is directly connected to the tenth rotation element, and the fifth rotation element is selectively connected to a transmission housing.