This article describes about the intelligence branch of the UNSC. For the music, see The Office of Naval Intelligence (song).

The Office of Naval Intelligence, acronym ONI (pronounced as oʊni), is the intelligence service branch of the UNSC Navy. Its formal name is the UNSC Military Intelligence Division.[4] Admiral Margaret Parangosky was the Commander in Chief of ONI until some point before 2558 at the latest, at which time her protege Serin Osman replaced her as Commander in Chief of the Office of Naval Intelligence.


This section requires expansion.

The Office of Naval Intelligence was founded in 2174.[1][2] One of the earliest projects undertaken by ONI was in 2321. This project, dubbed ORION, was an attempt to increase the effectiveness of Colonial Military Administration soldiers. However this initial run was eventually postponed.[5]

In 2491, the Carver Findings were released and ONI began to use it as their approach to the Insurrectionists.[6]


It is a division of the UNSC Navy that is responsible for counter-espionage and propaganda. Although it is under the jurisdiction of the Navy, ONI appears to report directly to HIGHCOM. It is responsible for intelligence matters across the UNSC. As such, ONI employs members of other military branches, and even civilians, to complete the Division's shadowy work.

Many of its functions and subdivisions, like the Beta-5 Division and the SPARTAN-III Program, are enigmatic, and its personnel are regarded as mysteries by mainstream naval officers. ONI personnel, especially officers, are often referred to as "spooks." Agents appear to enjoy significant latitude in the discharge of their duties, often violating moral boundaries or acquiring vast amounts of UNSC resources to achieve their ends.

The Office of Naval Intelligence often operates independently of other UNSC branches. At times it contravenes the law and UNSC protocol to complete top-secret missions. It appears to have an unusually large amount of military equipment for an intelligence service, and has a strong fleet presence. The Office of Naval Intelligence possesses a destroyer-sized prowler-class starship, UNSC Point of No Return, which is used as a command vessel and a secure conference location. ONI also maintains the UNSC's Prowler fleet, a major source of Covenant deployment intelligence, under the auspices of the UNSC Prowler Corps. ONI also manages field intelligence with units such as ONI Recon 111 liaising with mainstream UNSC military units.[7] ONI also has it's security, however it is under the jurisdiction of Naval Special Warfare.[8]


Intra-ONI dynamics are often strained with intense competition amongst its own personnel. Agents operate under heavy scrutiny with mistakes often leading to demotion or death.

Known ONI BranchesEdit





Other Ship ClassesEdit



Main article: ONI Facilities

Trivia Edit




  1. 1.0 1.1 Halo 4: The Essential Visual Guide, page 229
  2. Cite error: Invalid <ref> tag; no text was provided for refs named wayp
  3. Halo: First Strike – page 49
  4. Halo: Fall of Reach
  5. Halo Waypoint: - Universe - Factions - Spartans
  6. Halo Encyclopedia - page 44
  7. Halo 3 – Level: Tsavo Highway
  8. Halo 4: The Essential Visual Guide - page 34

Start a Discussion Discussions about Office of Naval Intelligence

  • Does ONI and UNSC will be new Covenant???

    17 messages
    • I don't know how months work where you are from, but I'm fairly sure that May-September is quite a bit more than three months.
    • According to santa claws conquers the Martians (very misleading tital) their is such a month as "septober".
  • ONI vs UNSC

    16 messages
    • Nice job finding this Vman, now lets see what kind of catastrophic destruction I can add to the story :) haha hahaha hahahahahha HAHAHAHAHhahahHAHA!
    • Lord of the STARS wrote:Nice job finding this Vman, now lets see what kind of catastrophic destruction I can add to the story :) haha hah...