To provide a yarn package supply apparatus including a compactly configured yarn end cutting device capable of securely processing a yarn end by using only a small number of cutters.

The yarn package supply apparatus 1 includes a parts feeder conveyor 2, a parts feeder 3 for aligning and supplying a plurality of yarn packages P dropped from the parts feeder conveyor 2, and the yarn end cutting device 4 for cutting a yarn end Q extending from each of the yarn packages P dropped to the parts feeder 3 so as to straddle between the parts feeder conveyor 2 and the parts feeder 3. The yarn end cutting device 4 includes a yarn end cutting section 21 having a cutter 20 for cutting the yarn end Q, a linear guide 22 for guiding the yarn end cutting section 21 along a single track R extending along a width direction of the parts feeder conveyor 2, and a rodless cylinder 23 for driving the yarn end cutting section 21 guided by the linear guide 22 so that the yarn end cutting section 21 reciprocates along the single track R.