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The lipid and fatty acid composition of muscles of mesopelagic fish species <i>Lampanyctus macdonaldi</i>, <i>Bathylagus euryops</i>, <i>Serrivomer beanii</i>, <i>Scopelogadus beanii</i> in the Irminger Sea at deep range were studied. The contents of the total lipids (TLs), total phospholipids (PLs), monoacylglycerols (MAGs), diacylglycerols (DAGs), triacylglycerols (TAGs), cholesterol (Chol), Chol esters, non-esterified fatty acids (NEFAs), and wax esters were determined by HPTLC; the PL classes were determined by HPLC; and fatty acids (FAs) were determined using GC. It was found significant differences in lipid profile of the studied fishes: Chol esters and waxes were dominant in <i>L. macdonaldii</i> and <i>S. beanii</i>, fish species with diel vertical migrations (DVM), while TAGs were prevalent in <i>B. euryops</i> and <i>Sc. Beanii</i>—non-migratory species. It was revealed the species-specific differences in FAs profiles of the studied fish. Along with this, it was detected the similarity of FAs in fish, which is associated with food sources. A comparative analysis of lipids and FAs among <i>L. macdonaldi</i> and <i>S. beanii</i> collected in the Irminger Sea and <i>L. alatus</i> and <i>S. beanii</i> collected in the Tropic Seamount revealed similar biochemical strategies for the accumulation of certain lipids characterized the mesopelagic inhabit despite latitude differences of the area of study.