The article provides relevant information on red-list species records of lichens, mosses, liverworts, and vascular plants from three Nature Monuments - Aikuaivenchorr Gorge, Kriptogrammovoe Gorge, and Juksporrlak. In total, 7 nationally (Nardia breidleri (Limpr.) Lindb., Encalypta brevipes Schljakov, Tetrodontium repandum (Funck) Schwägr., Arnica fennoscandica Jurtz. & Korobkov, Beckwithia glacialis (L.) Á. Löve & D. Löve, Cotoneaster cinnabarinus Juz., Papaver lapponicum (Tolm.) Nord.) and 33 regionally red-listed species were detected in the three nature monuments: 4 nationally and 11 regionally red-listed species in Aikuaivenchorr Gorge, 5 and 21 species in in Kriptogrammovoe Gorge, and 5 and 25 species in Juksporrlak, respectively. Two bryophytes (Metzgeria furcata (L.) Dumort and moss Grimmia elatior Bruch. ex Bals.-Criv. & De Not in Aikuaivenchorr Gorge as well as Grimmia alpestris (Schleich. ex F. Weber & D. Mohr) Schleich in Kriptogrammovoe Gorge) are new to the Khibiny Mts. One lichen species new to the Murmansk Region (Lecanora chloroleprosa (Vain.) H. Magn.) and several ones new to the Khibiny Mts. (Psora decipiens (Hedw.) Hoffm., Placidium rufescens (Ach.) A. Massal., Toninia squalida (Ach.) A. Massal.) were found in Juksporrlak. All the nature monuments of the Khibiny Mts. contribute significantly to biodiversity conservation, harbouring, respectively, 31 and 8 % of the protected species diversity of the Khibiny Mts. and the Murmansk Region at large.