Some demonstrative embodiments include devices, systems and/or methods of phase quantization. For example, a device may include a phase quantizer to receive a plurality of non-quantized phase values corresponding to a plurality of antenna elements of a phased-array antenna, based on the plurality of non-quantized phase values to select a predefined rotation angle, to determine a plurality of rotated non-quantized phase values by rotating the plurality of non-quantized phase values by the selected rotation angle, and to generate a plurality of quantized phase values by quantizing the plurality of rotated non-quantized phase values.