Tangzhou or Tang Prefecture (唐州), briefly known as Bizhou or Bi Prefecture (泌州) from 906 to the late 940s, was a zhou (prefecture) in imperial China seated in modern Tanghe County in Henan, China. It existed (intermittently) from 626 to 1380.

Geography

The administrative region of Tangzhou in the Tang dynasty is in southern Henan. It probably includes parts of modern:

• Under the administration of Nanyang:
  • Tanghe County
  • Tongbai County
  • Sheqi County
  • Fangcheng County
• Under the administration of Zhumadian:
  • Biyang County