The ParliamentSampo Knowledge Graph includes data regarding Finnish Parliamentary debates and actors. The RDF data has been converted using data from the Parliament of Finland's open data services and Wikidata. The Knowledge Graph contains harmonized data of speeches from the plenary sessions of the Finnish Parliament 1907–2024, and members and organizations of the Parliament. The data model is designed for representing speeches, interruptions, items (on agenda), documents and other aspects related to plenary session speeches and minutes as well as member of the parliament and biographical information about them focusing on their political career. This dataset is available on a public SPARQL endpoint (http://ldf.fi/semparl/sparql). To test and demonstrate its usefulness, this Knowledge Graph is in use in the semantic portal ParliamentSampo, explained in more detail in the project page. The Knowledge Graph can be downloaded also as CSV and XML files. See the dataset page on LDF.fi for more details. Version history 1.0.0, February 2023: Initial public release 1.0.1, April 2024: README.md addition 1.1.0, December 2024: added speeches from end of the year 2022, parliamentary session 2023, plenary sessions 112/1999, 120/1999 and 54/2016; changes to speeches in the plenary session 118/1999; fixes to "group of speaker" of speeches 1.2.0, February 2025: added speeches from the parliamentary session 2024 1.2.1, June 2025: fixes to speeches in plenary sessions 86–132/1999 (In dataset versions 1.1.0 and 1.2.0 some speeches were erroneously mixed: the same speech id had content of two speeches. This was due to processing the source data of the plenary sessions both from PDF files and HTML files. The current data on these plenary sessions is based only on the HTML source data.)