The Assembly of the Seimas of the Republic of Lithuania and the Sejm and Senate of the Republic of Poland was established on 12 June 1997. The objective of the Assembly is to develop and strengthen cooperation between the two countries by discussing matters of mutual interest and issuing joint documents. The Assembly adopts statements, declarations, addresses and resolutions.

The principles and procedure of the Assembly are regulated by the Statute. The Seimas of Lithuania and the bicameral Parliament of Poland each form delegations of 20 parliamentarians based on the principle of proportional representation of political groups in each parliament.

Traditionally, the delegations to the Assembly are headed, respectively, by one of the Deputy Speakers of the Seimas of Lithuania and one of the Deputy Marshals of the Sejm and Senate of Poland.

The Assembly meets in plenary sessions held twice a year alternately in Lithuania and Poland. Each session culminates in the adoption of a document.

The Assembly may, when necessary, set up standing ad hoc commissions.

The working languages of the Assembly are Lithuanian and Polish.

No membership fees are charged.

To date, the Assembly has already held 21 sessions: 1st Session, Vilnius, 02/07/1997; 2nd Session, Warsaw, 26/01/1998–27/01/1998; 3rd Session, Vilnius, 21/11/1998; 4th Session, Krakow, 16/05/1999; 5th Session, Vilnius, 27/11/1999; 6th Session, Warsaw, 01/06/2000; 7th Session, Vilnius, 23/02/2001; 8th Session, Warsaw, 09/06/2001; 9th Session, Vilnius, 08/06/2002; 10th Session, Warsaw, 29/11/2002–30/11/2002; 11th Session, Palanga, 20/06/2003–21/06/2003; 12th Session, Wroclaw, 02/07/2004–04/07/2004; 13th Session, Vilnius, 03/06/2005–04/06/2005; 14th Session, Warsaw, 01/06/2006–03/06/2006; 15th Session, Vilnius, 30/11/2006–02/12/2006; 16th Session, Warsaw, 29/06/2007–01/07/2007; 17th Session, Vilnius, 03/04/2008–05/04/2008; 18th Session, Warsaw, 30/06/2008–02/07/2008; 19th Session, Vilnius, 08/05/2009–10/05/2009; 20th Session, Warsaw, 11/02/2019–12/02/2019; 21st Session, Vilnius and Palanga, 06/09/2019–09/09/2019.

Opening of the 21st Session of the Assembly of the Seimas of the Republic of Lithuania and the Sejm and Senate of the Republic of Poland. 7 September 2019 

Photos by Olga Posaškova, Office of the Seimas.

The Seimas Delegation to the Assembly of the Seimas of the Republic of Lithuania and the Sejm and Senate of the Republic of Poland was headed by Arvydas Nekrošius, Deputy Speaker of the Seimas, during the 2016–2020 legislative period of the Lithuanian parliament. The Assembly resumed its activities after a ten-year break. At its 20th Plenary Session in Warsaw on 11–12 February, the Assembly adopted the declaration of 12 February 2019 expressing satisfaction with the intensifying political dialogue between Lithuania and Poland, at the bilateral level and the levels of international and regional organisations. 

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On 8 December 2020, pursuant to Article 81(1) of its Statute, the Seimas formed 10 parliamentary delegations, including its 20-member strong Delegation to the Assembly of the Seimas of the Republic of Lithuania and the Sejm and Senate of the Republic of Poland, for the 2020–2024 legislative period. The Seimas approved Paulius Saudargas, Deputy Speaker of the Seimas, as Head of the Delegation with Evelina Dobrovolska and Algirdas Sysas as Deputy Heads.

22nd Session of the Assembly of the Seimas of the Republic of Lithuania and the Sejm and Senate of the Republic of Poland. 26 March 2021 

Photo by Olga Posaškova, Office of the Seimas.