Investigation
Investigation or Investigations may refer to:

Law enforcement
Investigation, the work of a detective
Investigation, the work of a private investigator
Criminal investigation, the study of facts, used to identify, locate and prove the guilt of an accused criminal
Criminal investigation department, the branch of British Police force to which plainclothes detectives belong
Federal Bureau of Investigation, the primary investigative arm of the US Department of Justice
Tax investigation

Medicine
Clinical trial, an investigation conducted to collect data for new drugs or devices
Investigational New Drug, a category in a USFDA program
Outbreak Investigation

Science and maths
Forensic science investigation, in fields such as accounting, science, engineering and information technology
Investigations in Numbers, Data, and Space, a K-5 mathematics curriculum

Arts, entertainment, and media
Literature
The Investigation, a 1959 book by Stanisław Lem
The Investigation (play), a 1965 play by Peter Weiss

Television
"Investigations" (Star Trek: Voyager), an episode of the television series Star Trek: Voyager
Investigation (TV channel), a Canadian French-language specialty channel
The Investigation (TV series), a 2020 six-part Danish TV series
Investigation Discovery, a digital cable channel

Other uses in arts, entertainment, and media
Investigate (magazine), a New Zealand current affairs magazine
Investigation (film), a 2006 Bulgarian drama
Investigative journalism, the practice of in-depth reporting or analysis
Temporal Investigations, an agency of the government of the United Federation of Planets in the fictional universe of Star Trek

See also
All pages with titles containing Investigation
Background investigation, an investigation into an individual's past
Congressional investigation, an inquiry run by a congressional committee
Discovery (observation), the act of detecting something new, or something "old" that had been unrecognized as meaningful
Examination (disambiguation)
Forensic science, in fields such as accounting, science, engineering and information technology
Investigator (disambiguation)
Research