Jajuara, also written Jajuar and Yajuar, is the largest village in the Muzaffarpur district of Bihar in India, and the second-largest village in Bihar.

The original name Yajuar comes from Yajur vedasaya agara yasya Yajuara, which means "Village of people who know Yajurveda one of the four Veda in Hinduism".

The Yajuar region is situated in the district of Muzaffarpur in Bihar, India. The village covers 1,876 hectares (18.76 km²), the largest village in Katra block. It is 55 km (34 mi) from Muzaffarpur, and 51.2 km (31.8 mi) from Darbhanga. There is no easy way to reach its district Muzaffarpur during rainy season. In recent times, solar energy has become very popular, but nowadays it is electricity.

The climate is mainly dry and cool. In summer the temperature varies from 35 °C (95 °F) to 45 °C (113 °F). In winter it is typically 5 °C (41 °F) to 15 °C (59 °F). The elevation is 51m close to sea level. The soil is suited for agriculture, which is the main economic activity of the region.

There are three panchayats in Yajuar, namely Yajuar East, Yajuar Middle and Yajuar West Village. Jajuar is part of Katra CD block. Its revenue village name is Jajuara. Now yajuar got its own Police Station in 2023

As of the 2011 Census of India^[update] the population of Jajuara was 25,875 making it the second most populated village in Bihar. The male to female ratio in the village was 1,089/1,000. The literacy rate in the city was about 60%, male literacy being 69% and female literacy being 50%.

Since Yajuar is a part of Mithila, Maithili language is spoken by all of the population. Hindi is the second most common language and limited use of English language is seen.

The culture is very traditional. All the major Indian festivals are celebrated here.