Motihari (Vidhan Sabha constituency) (Hindi: मोतिहारी विधान सभा निर्वाचन क्षेत्र) is an assembly constituency in Purvi Champaran district in the Indian state of Bihar.
As per orders of Delimitation of Parliamentary and Assembly constituencies Order, 2008, 19. Motihari (Vidhan Sabha constituency) is composed of the following: Motihari community development block including Motihari nagar parishad and Lautnaha notified area and Piprakothi CD block.
Motihari (Vidhan Sabha constituency) is part of 3. Purvi Champaran (Lok Sabha constituency). It was earlier part of Motihari (Lok Sabha constituency).
Election results 
In the November 2010, October 2005 and February 2005 state assembly elections Pramod Kumar of BJP won the 19 Motihari assembly seat defeating Rajesh Gupta of RJD in November 2010 and Rama Devi of RJD in October 2005 and Februruay 2005. Contests in most years were multi cornered but only winners and runners are being mentioned. Rama Devi of RJD defeated Pramod Kumar of BJP in 2000. Triveni Tiwari of CPI defeated Laxman Prasad of BJP in 1995 and 1990, and Rajendra Prasad of Congress in 1985. Prabhawati Gupta of Congress defeated Triveni Tiwari of CPI in 1980 and Raghunath Gupta of Janata Party in 1977.