Michael O'Learys' Ryanair received 238 complaints.
Home and garden retailer Rathwood has topped the CCPC complaints list for the first half of year, with 737 reports.
There were issues earlier this year relating to delays in delivering orders, and issuing refunds.
Mullingar's Michael O'Learys' Ryanair followed with 238, then Sky, Currys, and Harvey Norman.
There were over 22,700 complaints made to the consumer watchdog's helpline, with faulty goods, second-hand cars, and home improvements being the main reasons for making a complaint.
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