The 75^th Anniversary of the Tragic Events in the Municipalities of Ostrý Grúň and Kľak
Date of Issue: January 17, 2020

The 75^th Anniversary of the Founding of the United Nations
Date of Issue: February 14, 2020

The 100^th Anniversary of the Establishment of the Slovak National Theatre
Date of Issue: February 28, 2020

Easter 2020: The Traditional Slovak Blueprint
Date of Issue: March 13, 2020

Joint Issue with Italia: Milanophil 2020 - ACT NOW
Date of Issue: March 27, 2020

Personalities: Andrej Sládkovič (1820 – 1872)
Date of Issue: March 30, 2020

EUROPE 2020: Ancient Mail Routes – The Magna Via
Date of Issue: April 30, 2020

Personalities: Maximilián Hell (1720 – 1792)
Date of Issue: May 13, 2020

A Joint Issue with Poland: The 100^th Anniversary of the Birth of Pope John Paul II (1920 – 2005)
Date of Issue: May 18, 2020

The Philatelic Olympiad
Date of Issue: June 5, 2020

Nature Protection: The Botanical Garden in Košice – Magnolia Grandiflora
Date of Issue: June 17, 2020

The 1150^th Anniversary of the Consecration of St. Methodius, Archbishop of Great Moravia and Pannonia
Date of Issue: July 4, 2020

The 125^th Anniversary of MHD in Bratislava
Date of Issue: July 31, 2020

COVID-19
Date of Issue: August 21, 2020

The XVI. Paralympic Games, Tokyo
Date of Issue: August 24, 2020

Beauties of Our Homeland: The Water Castle of Šimonovany
Date of Issue: September 4, 2020

150^th Anniversary of the Establishment of St. Adalbert's Society in Trnava
Date of Issue: September 18, 2020

Joint Issue with Mongolia: Falconry
Date of Issue: October 2, 2020

ART: Ferdinand Katona (1864 – 1932)
Date of Issue: October 20, 2020

ART: Ladislav Vychodil (1920 – 2005)
Date of Issue: October 20, 2020

Joint issue with Malta: Viticulture in Slovakia
Date of Issue: October 24, 2020

Joint issue with Malta: Viticulture in Malta
Date of Issue: October 24, 2020

The Christmas Mail 2020
Date of Issue: November 13, 2020

Christmas 2020: The Traditional Slovak Blueprint
Date of Issue: November 13, 2020

Postage Stamp Day: Vladimír Machaj (1929 – 2016)
Date of Issue: December 4, 2020