Bajjika or Vajjika (Maithili:বজ্জিকা Hindiवज्जिका) is an Indian language spoken by about eleven million people, mainly in the western part of Muzaffarpur District, Vaishali, East Champaran and West Champaran districts of Bihar and about eight hundred thousand people in the adjacent regions of Nepal.

The language is widely spoken in the Western part of Mithila region. It is similar to Maithili and Angika. Sources such as CIIS and The Ethnologue regard it as a dialect of Maithili language. However, in the 21st century, there have been claims for an independent status for the language within the same family of Bihari languages.

"Lakshmi Elthin Hammar Angna (2009)" is the first formal feature film in Bajjika. Sajan Aiha Doli le ke came after that. Many Bajjika films have been made before and after that. But, they were categorized as Maithili Films, as no clear border exists between Bajjika Maithili and Standard Maithili.

Surendra Mohan Prasad, Yogendra Rai, Dr. Yogendra Sinha, Dr. Rameshwar Prasad, Nirmal Milind, Chandra Prakash, Chandra Kishore etc. are/were the famous writers of Bajjika.