The official language(s) of the state of Bihar is/are:

Hindi and Urdu
Hindi
Bhojpuri
Maithili

The official language of Bihar is Hindi. Urdu is also recognized as a second official language in the state. Bhojpuri and Maithili are two other major languages spoken in Bihar, but they are not official languages.

Hindi is the most widely spoken language in Bihar, with over 80% of the population speaking it as their first language. Urdu is the second most widely spoken language, with around 10% of the population speaking it as their first language. Bhojpuri and Maithili are also widely spoken, with around 10% of the population speaking each language as their first language.

Hindi is the official language of India, and it is also the official language of Bihar. Urdu is a recognized minority language in India, and it is also the official language of Bihar. Bhojpuri and Maithili are not official languages of India, but they are recognized minority languages in Bihar.

Hindi is a Indo-Aryan language, and it is the most widely spoken language in India. It is also the fourth most widely spoken language in the world, with over 500 million speakers. Hindi is written in the Devanagari script.

Urdu is an Indo-Aryan language, and it is the second most widely spoken language in India. It is also the 22nd most widely spoken language in the world, with over 60 million speakers. Urdu is written in the Nastaliq script.

Bhojpuri is an Indo-Aryan language, and it is the third most widely spoken language in Bihar. It is also the 13th most widely spoken language in India, with over 40 million speakers. Bhojpuri is written in the Devanagari script.

Maithili is an Indo-Aryan language, and it is the fourth most widely spoken language in Bihar. It is also the 14th most widely spoken language in India, with over 30 million speakers. Maithili is written in the Devanagari script.