“Days of Atheism” are organized each spring in Warsaw by Polish atheists to commemorate the death of the great atheist Kazimierz Lyszczynski of 17th century and to affirm freedom of conscience today.

The event is a celebration of atheism, which each year attracts increasing numbers of atheists from Poland and from around the world. It includes various activities such as the historical reenactment of the execution of Kazimierz Lyszczynski, lectures, panel discussions, exhibitions, and film screenings. One of the key events is a Gala Dinner with the Atheist of the Year Award Ceremony in national and international categories. Among the winners of this Prize there are such distinguished atheists as Maryam Namazie from Iran/GB) and Sanal Edamaruku from India/Finland (2014), Waleed el-Husseini from Palestine/France (2015), Mario Ramadan from Lebanon (2016), Michael Nugent from Ireland and Fauzia Ilyas from Pakistan/Netherlands (2017), David Silverman from USA and Rahma Essid from Tunis (2018), Freedom from Religion Foundation from USA and Armin Navabi from Canada (2019), Jean-Luc Romero from France (2020).

DAYS OF ATHEISM 2023: 31 MARCH – 01 April 2023

After two years of pause (2021 because of COVID and 2022 because we put all our efforts and financial resources to help Ukrainian refugees) we are back! The main theme and the slogan of the 2023 edition of Atheist Days is:
SCIENCE – NOT DELUSIONS! In the face of growing attacks of obscurantism in Poland and in the world, which threaten the development of humanity, we consider promoting a worldview based on scientific knowledge as one of the most important tasks.

We invite you to Warsaw for this unique event in the world. Many great Polish and international speakers are expected. We are pleased and honored to inform you that Richard Dawkins has accepted our invitation. You can meet them personally during the Gala Dinner with the Atheist of the Year 2023 Award and the Special Prize 2023 Ceremony on Saturday, 01 April.

Simultaneous interpretation in English will be provided to all parts of program.


FULL REGISTRATION  220 euro per person in double room, 260 euro in single room: 3 nights in the hotel, free admission to all events including the Gala Dinner with the Ceremony of the Atheist of the Year 2023 Award. Possible changes on demand.

LIMITED REGISTRATION 45 euro – free entry to the Conference and/or 45 euro for the Gala Dinner. Accommodation not included.

Register now by sending e-mail to: biuro@lyszczynski.com.pl (you will receive further instructions)

Phone: +48 501518757


Kazimierz Lyszczynski also known as Casimir Liszinski (1643 – 1689) – Polish philosopher, who was accused, tried, and cruelly executed for atheism. In the treatise “De non existentia Dei” he asserted that God, being “a creation of a Man”, does not exist and that “Religion was constituted by people without religion” with the aim of oppressing simple people.

Kazimierz Lyszczynski was the most eminent Polish mind of 17th century, a man far ahead of his time. Yet, he is forgotten in Poland and totally unknown abroad. It’s a high time to render him a historical justice and let him join the greatest thinkers of his epoch such as Giulio Cesare Vanini or Giordano Bruno.


Our Foundation is named after Kazimierz Lyszczynski. We see ourselves as his intellectual heirs who promote:

  • atheistic worldview based on rational reason, scientific evidence, and secular ethics,
  • freedoms of thought, expression and conscience, incl. in media, science, and art,
  • secular state, especially secular education,
  • growth and cooperation of atheist communities in Poland and worldwide.

We organize: International Days of Atheism in Warsaw (end March), Spring, Summer and Autumn Atheists Gatherings, Atheists Picnic (May), campaigns Right to Die, Stop Church Sexual Abuse (Baby Shoes Remember Poland), Homophobia kills, Humanists across borders for Ukraine.

Our site:


Kazimierz Lyszczynski Foundation is an independent organization financed through voluntary work and donations. We don’t receive any state grants or subventions.
You can help us making a payment:
Fundacja im. Kazimierza Łyszczyńskiego,
IBAN:PL 25 1750 0012 0000 0000 2355 0865, BIC: RCBWPLPW (PLN)

IBAN PL 79 1600 1462 1079 6531 2000 0001, BIC: RCBWPLPW (Euro)
Payment title: Donation (or Atheist Days 2023)