St.Thomas' Junior National School is a mixed junior primary school in Lucan, and was founded in 1976.

The school was thirty five years old in 2011, occupying it’s current building for thirty three of those thirty five years.

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Formal Registration of Junior Infants for Sept 2012 will take place in the school on Monday 23rd, Tuesday 24th & Wednesday 25th January 2012 from 10 am to 12 o'clock. Copies of your child's birth & baptismal certificates along with your child's P.P.S. No. and a house utility bill will be required on the day of enrolment.

Enrolment to the school is subject to the school's enrolment policy.