ITT may refer to:

In business:

• ITT Corporation, a large manufacturing conglomerate
• Invitations to tender for a contract; a call for bids

In education:

• ITT Technical Institute, a private American technical institute
• Institute of Technology, Tallaght, a technical college in Dublin, Ireland
• Institute of Technology, Tralee, a technical college in Tralee, Ireland

In media:

• In These Times, a politically progressive monthly magazine of news and opinion
• It Takes Two (Australian TV series), an Australian television show
• Cousin Itt, a member of the fictional Addams Family

In technology:

• Immersed Tube Tunnel, a kind of underwater tunnel composed of segments

ITT may also mean:

• "In this thread"; see Internet slang
• Individual time trial, a bicycle racing term
• Intention to treat analysis, a medical analysis in epidemiology
• Investigator Initiated Trial, a clinical study started and planned by the investigator/doctor

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