Paschim Champaran Lok Sabha constituency (Hindi: पश्चिम चंपारण लोकसभा निर्वाचन क्षेत्र) is one of the 40 Lok Sabha (parliamentary) constituencies in Bihar state in eastern India. This constituency came into existence in 2008, following delimitation of the parliamentary constituencies based on the recommendations of the Delimitation Commission of India constituted in 2002.
Presently, this constituency comprises six Vidhan Sabha segments, which are: