Connolly station just across the road (ish) has actual lockers in the ticket desk area. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　There are two different sized lockers, one for small hand luggage + other personal items and the other will take suit cases.

Busaras

Dont don't go near this have to carry luggage downstairs horrible place. Large locker €10 holds 1 large suitcase only, carryon wouldn't fit as well.This was when I found one that worked.

Dubling Airport

A left luggage facility is available for customers using both Terminals 1 & 2. It is located in the Terminal 1 Short-Term Car Park Atrium. The facility offers short and long term storage of luggage.

The facility, operated by Greencaps, is open from 06.00 to 23.00 daily.  The following is a guide to the prices per 24 hour period for left luggage. *Please note these prices are subject to change.

Envelope           €3:75
Small item          €4:75
Medium item      €6:75
Large item          €9:00
Extra large item  €12:00

Heuston Station

 note for people wanting to store luggage at Heuston - the left luggage facility has really strange opening hours and chances are it will be closed either when you want to leave your suitcase, or when you want to collect it. Be warned