Invasive aquatic plants can spread rapidly causing many negative effects on both the structure and functioning of aquatic ecosystems. They can also hinder navigation, fishing, water tourism, and recreation. Early detection and rapid response to invasive aquatic plants can prevent their further spread and negative impacts. In this study, we present the first record of two invasive alien aquatic plants Limnobium laevigatum and Pontederia crassipes in Poland. The plants were found in an artificial pond in the eastern part of the city of Kraków, southern Poland, on 16 September 2020. The pond was also occupied by Pistia stratiotes, another invasive alien aquatic plant that has been recently recorded in Poland. The locality is mapped using the ATPOL cartogram method, photographic documentation of the habitat and species is provided and the status of L. laevigatum and P. crassipes in the Polish flora is discussed. [ABSTRACT FROM AUTHOR]