Krzysztof Jan Śmiszek (born on August 25, 1979, in Stalowa Wola) is a lawyer, politician, academic teacher, human rights and minority rights activist, and a doctor of legal sciences. He is a co-founder and former chairman of the Polish Society of Anti-Discrimination Law, a member of the 9th and 10th term Sejm, and the vice-chairman of the Nowa Lewica (New Left).

In 2003, he graduated from the Faculty of Law and Administration at the University of Warsaw. In 2006, he completed the Postgraduate Study of European Law at UW. In 2016, he earned a Ph.D. in legal sciences with a specialization in European law based on his dissertation titled "European Equality Standard and Polish Law: Material and Institutional Aspects," supervised by Prof. Mirosław Wyrzykowski.

From 2003 to 2005, he worked as a lawyer in the office of the government's plenipotentiary for equal status of women and men (at that time held by Izabela Jaruga-Nowacka and Magdalena Środa), focusing on anti-discrimination legislation. He was an expert for Polish NGOs dealing with anti-discrimination issues. From 2008 to 2010, he worked in Brussels as a lawyer and program coordinator at EQUINET, the European network of equality bodies. From 2011 to 2016, he was a member of the Human Rights Department at the Faculty of Law and Administration at the University of Warsaw.

In 2014, he became a member of the European Equality Law Network, an expert network in the field of non-discrimination. He also served as a trainer in the Human Rights Education for Legal Professionals (HELP) program conducted by the Council of Europe. From 2017 to 2019, he taught at the Faculty of Law, Administration, and International Relations at the Andrzej Frycz Modrzewski Krakow University. He was a scholar at the University of Michigan.

In 2017, he became a member of the program board of the Wiktor Osiatyński Archive. He joined the editorial board of the "Anti-Discrimination Law Review" legal journal.

In the parliamentary elections in 2019, he was elected to the 9th term Sejm in the Wrocław district, receiving 43,447 votes. He became the chairman of the Parliamentary Group for the Equality of the LGBT+ Community and a member of the Committee on Justice and Human Rights and the Committee on European Union Affairs. He also joined the Polish delegation to the Parliamentary Assembly of the Council of Europe. In 2023, he successfully sought re-election to the Sejm in the Wrocław district, receiving 34,577 votes.