A planetary gear train of an automatic transmission for a vehicle may include an input shaft receiving torque of an engine, an output shaft outputting torque of the engine, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first shaft directly connected to the input shaft, a second shaft directly connected to the output shaft, a third shaft, a fourth shaft selectively connectable to the third shaft, a fifth shaft selectively connectable to the third shaft, a sixth shaft, a seventh shaft, and an eighth shaft selectively connectable to the second shaft and the fourth shaft.