The Nigeria Immigration Service (NIS) is a government agency of the Federal Republic of Nigeria, responsible for the country's border security and migration management. It was established by the Act of Parliament in 1963. In 2015, the 1963 Act was repealed and replaced with the Immigration Act 2015 which positions the service with the legal instrument to combat the Smuggling of migrants (SOM) in Nigeria. The Nigeria Immigration Service is a paramilitary agency under the Federal Ministry of Interior and it is considered a critical member of the National Security Architecture of Nigeria.

The Nigeria Immigration Service (NIS) was separated from the Nigeria Police (NP) in August 1958, known at that time as the Immigration Department, and headed by the Chief Federal Immigration Officer.

The Immigration Department was established by an Act of Parliament (Cap 171, Laws of the Federation of Nigeria) on August 1, 1963, when Alhaji Shehu Shagari was the Minister of Internal Affairs (a position now referred to as Minister of Interior).

The initial Law regulating Immigration Duties was the Immigration Act of 1963 which was amended in 2014 and again in 2015 (Immigration Act, 2015).

The Service has from 1963 been restructured to manage modern migration in line with global, regional, and sub-regional political alignments.

The NIS has leveraged the use of Information and Communication Technologies in its operations including:

As empowered by Section 2 of the Immigration Act, 2015, the Service is responsible for:

The Nigeria Immigration is administratively structured into 8 directorates and 7 units.