| Duruthu Full Moon Poya Day | Fri, Jan 10, 2020 |
| Tamil Thai Pongal Day | Wed, Jan 15, 2020 |
| Independence Day of Sri Lanka | Tue, Feb 4, 2020 |
| Navam Full Moon Poya Day | Sat, Feb 8, 2020 |
| Maha Shivratri | Fri, Feb 21, 2020 |
| Madin Full Moon Poya Day | Mon, Mar 9, 2020 |
| Madin Full Moon Poya Day | Mon, Mar 9, 2020 |
| Madin Full Moon Poya Day | Mon, Mar 9, 2020 |
| Bak Full Moon Poya Day | Tue, Apr 7, 2020 |
| Good Fridayy | Fri, Apr 10, 2020 |
| Sinhalese New Year | Mon, Apr 13, 2020 |
| Sinhalese New Year's Eve | Mon, Apr 13, 2020 |
| Puthandu | Tue, Apr 14, 2020 |
| Labour Day | Fri, May 1, 2020 |
| Vesak Full Moon Poya Day | Thu, May 7, 2020 |
| Eid al-Fitr | May 23 – 24, 2020* |
| Poson Full Moon Poya Day | Fri, Jun 5, 2020 |
| Asalha Puja | Sun, Jul 5, 2020 |
| Nikini Full Moon Poya Day | Mon, Aug 3, 2020 |
| Binara Full Moon Poya Day | Wed, Sep 2, 2020 |
| Vap Full Moon Poya Day | Thu, Oct 1, 2020 |
| Prophet's Birthday | Oct 28 – 29, 2020* |
| Vap Full Moon Poya Day | Sat, Oct 31, 2020 |
| Diwali | Sat, Nov 14, 2020 |
| Ill Full Moon Poya Day | Mon, Nov 30, 2020 |
| Christmas Day | Fri, Dec 25, 2020 |
| Unduwap Full Moon Poya Day | Wed, Dec 30, 2020 |