The charity, Inner City Helping Homeless, is hoping to break its record for its shoebox present appeal, now in its fourth year.
Run in conjunction with Luas operator Transdev, people are being invited to bring presents for those in emergency accommodation or direct provision to a Santa Grotto in a tram at Connolly Station.
The 'fillaluas' appeal got 20,000 presents last year and Anthony Flynn of Inner City Helping Homeless said they are hoping to top 25,000 this year.
Secondary school children from The Donaghies Community School, Brazilian English language students from DCAS and a group from the company Engergia were among those donating this morning.
The appeal runs from 7am to 7pm and presents are marked according to whether are for adult male or female, boy or girl.
Presents will be given to homeless people and the surplus will be stored in a depot to be released as needed over the next 12 months.
Half way through the day and the atmosphere is brilliant at the #fillaluas on the @luas platform in Connolly Station.— ICHHDUBLIN (@ICHHDUBLIN) December 6, 2018
We are here until 7 and the generosity of everyone is heartwarming. #fillaluas pic.twitter.com/yXbxeXpCpQ