Investigative journalism is a kind of journalism in which reporters deeply investigate a topic of interest, often involving crime, political corruption, or some other scandal. An investigative journalist may spend a considerable period researching and preparing a report, sometimes months or years, whereas a typical daily or weekly news reporter writes items concerning immediately available news. Most investigative journalism is done by newspapers, wire services and freelance journalists. An investigative journalist's final report may take the form of an exposé.

The investigation will often require an extensive number of interviews and travel, other instances might call for the reporter to make use of activities such as: surveillance techniques, tedious analysis of documents, investigations of the performance of any kind of equipment involved in an accident, patent medicine, scientific analysis, social and legal issues, and the like. In short, investigative journalism requires a lot of scrutiny of details, fact-finding, and physical effort. An investigative journalist must have an analytical and incisive mind with strong self-motivation to carry on when all doors are closed, when facts are being covered up or falsified and so on.