The Home Office (HO) is a ministerial department of the Her Majesty's Government, responsible for immigration, security, and law and order. As such it is responsible for the police, British Visas and Immigration, and the Security Service (MI5). It is also in charge of government policy on security-related issues such as drugs, counter-terrorism, and ID cards. It was formerly responsible for Her Majesty's Prison Service and Probation Service, but these have transferred to the Ministry of Justice.

Small office/home office (or single office/home office; SOHO) refers to the category of business or cottage industry that involves from 1 to 10 workers.