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, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a first shaft, a second shaft, a third shaft, a fourth shaft, a fifth shaft selectively connectable to the second shaft, a sixth shaft connected to the input shaft, and selectively connectable to each of the third shaft and the fourth shaft, a seventh shaft connected to the output shaft, and an eighth shaft.