Fluctuation may refer to:
Physics and mathematics Statistical fluctuations, in statistics, statistical mechanics, and thermodynamics Thermal fluctuations, statistical fluctuations in a thermodynamic variable Quantum fluctuation, arising from the uncertainty principle Primordial fluctuations, density variations in the early universe Universal conductance fluctuations, a quantum physics phenomenon encountered in electrical transport experiments in mesoscopic species
Finance and economics Economic conjuncture, a critical combination of events in economics Volatility (finance), price fluctuation