We report a detailed de Haas–van Alphen (dHvA) study of the recently discovered kagome metal ${\mathrm{LuNb}}_6{\mathrm{Sn}}_6$ using torque magnetometry, electrical transport, magnetization, and heat-capacity measurements. Temperature-dependent torque, resistivity, and heat capacity data reveal a charge density wave (CDW) transition at $T_{\mathrm{CDW}}=85\mathrm{K}$. The thermal hysteresis observed in both measurements establishes the first-order nature of the transition. Quantum oscillation measurements identify two major dHvA frequencies: $F_{\alpha }\approx 20\mathrm{T}$ and $F_{\beta }\approx 200\mathrm{T}$ for a field applied within the ab plane, and their angular dependence is consistent with ellipsoidal Fermi surface (FS) pockets. Landau fan diagram analysis reveals evidence for a nontrivial Berry phase associated with the $F_{\alpha }$ pocket, indicating possible nontrivial electronic topology in ${\mathrm{LuNb}}_6{\mathrm{Sn}}_6$. Analysis of the temperature and magnetic field dependence of the oscillations using the Lifshitz-Kosevich formula yields electronic parameters that suggest anisotropic quantum transport properties. First-principles calculations provide further insight into the electronic structure, revealing Dirac-like band crossings, a flat band, and multiple van Hove singularities near the Fermi level. Our calculations based on the pristine phase cannot fully reproduce the experimentally observed quantum oscillation frequencies, suggesting that CDW-induced Fermi surface (FS) reconstruction plays a crucial role in the ground-state electronic structure of ${\mathrm{LuNb}}_6{\mathrm{Sn}}_6$. These results provide new insight into the FS topology and electronic structure of ${\mathrm{LuNb}}_6{\mathrm{Sn}}_6$, enriching our understanding of the electronic properties of kagome materials.

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• Charge density waves
• Electronic structure
• Fermi surface
• de Haas-van Alphen effect