Lasosna

{{Infobox river

| name = Lasosna

| name_other = Łosośna

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| mouth_location = Neman

| mouth_coordinates = {{coord|53.6777|23.7781|region:BY|display=it}}

| progression = {{RNeman}}

| subdivision_type1 = Country

| subdivision_name1 = Poland, Belarus

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The Lasosna, Lasasyanka ({{langx|be|Ласосна, Ласасянка}}), {{langx|pl|Łosośna}}Agata Lewandowski, Łosośna - the Unknown Valley. Not the Last Arrival for…Puciłki, „Znad Wilii”, nr 3(79) z 2019 r., p. 58-64, (in Polish).http://www.znadwiliiwilno.lt/wp-content/uploads/2019/10/Znad-Wilii-3-79m-1.pdfHelena i Leonard Drożdżewiczowie, Antologia Doliny Łosośny, (in Polish)http://193.0.118.54/search/query?term_1=Antologia+Doliny+%C5%81oso%C5%9Bny&theme=nukat is a river in Poland (Sokółka County) and Belarus (Hrodna and Hrodna district). Of the river's 46 km length, 24 km is in Poland and the rest in Belarus. It is a left-bank tributary of the Neman.