- Irish Examiner
- Irish Global Health Education Innovation
- Irish Internet Association
- Irish Life
- Irish Marketing Journal
- Irish Mediaency
- Irish Photo Archive
- Irish Pub Passport
- Irish Radioplayer
- Irish Research Council(IRC)
- Irish Stock Exchange
- Irish Titan
- Irish Triathlon
- IRISH TV
- Irish Venture Capital Association
- Irish Web Developers
- Irish Web HQ
- Irish Whiskey Museum
- Irish Yapping
- IrishAngels
- IRISHDEV
- irisnote
- iRISQ
- Iristel Ibérica
- Iristick
- Iristrace
- IRISTV
- IrisVR
- Irisys
- Irium Software
- iRiver
- IRIWP
- IRIX
- IrixMedia LLC
- Irknet Telecom
- IRL
- IRL Connect
- IRL Gaming
- irLike
- IRLYNX
- IRM
- IRM Group
- IRMFT - I Remember My First Time
- iRMX
- IROA Technologies LLC
- iRoam - Global SIM and Wi-Fi Roaming Business
- iRobot
- iRoboticist
- IROCKBAGS
- IROCKE
- iRocket Ventures
- irodori
- Irody
- IroFit
- Irogon
- iROKO Partners
- Iroko Pharmaceuticals
- iROKOtv
- iromono
- Iron Belt Studios
- Iron Bow Technologies
- Iron Cloud
- Iron Cove Solutions
- Iron Drone
- Iron Gate Capital (IGC)
- Iron Group
- Iron King Kennels
- Iron Mountain - Russia/Ukraine
- Iron Mountain Incorporated
- Iron Mountain, Inc.
- Iron Mountains in the Clouds
- Iron Ox
- Iron Peak Advisors
- IRON phoenix Technologies
- Iron Pillar
- Iron Rock
- Iron Sight Executive Search
- Iron Solutions
- Iron Speed
- Iron Springs Design
- Iron Street Labs
- Iron Systems
- Iron Trainers
- IRON Ventures
- Iron Will Innovations
- Iron Yard Ventures
- Ironark Software
- Ironbee
- Ironbridge Software Inc
- IronCapital
- Ironclad
- Ironclad Encryption
- IRONCloud Industries
- IronCore Labs
- IronCurtain Entertainment
- IronDoors
- Irondrone
- Ironfire Capital
- Ironflow Technologies