The Predynastic Zhou or Proto-Zhou refers to the state of Zhou that existed in the Guanzhong region of modern Shaanxi province during the Shang dynasty of ancient China, before its conquest of the Shang in 1046-1045 BC which led to the establishment of the Zhou dynasty. It was ruled by the Ji clan. According to histories, Predynastic Zhou rose as a western vassal of the Shang, acting as its ally until their influence surpassed that of the dynasty.
Records about Predynastic Zhou came from two sources. The Shang dynasty kept records about Zhou in oracle bones. The texts about Zhou inscribed by the Shang court are mainly those from the reign of Wu Ding and the last Shang monarchs. After the fall of Shang, the Ji clan established the Zhou dynasty and started their own narrative about previous generations. The Book of Documents and the Bamboo Annals are two major historical sources. Later, Sima Qian wrote about the country using those texts as reference.