Middle Pleistocene glaciation in the Pyrenees is still poorly documented, but the record of ice fluctuations that occurred before 29 ka within the time span of the Late Pleistocene has benefited from a growing catalogue of geochronological data. Here we provide an exhaustive review of results obtained from different generations of ice-marginal deposits for that period, including 14C ages from glaciolacustrine deposits, 10Be and 36Cl exposure ages from boulders embedded in moraines and/or glacially scoured bedrock steps, and optically stimulated luminescence ages from glaciofluvial outwash terraces. Data currently available indicate that the most extensive Pyrenean glaciation of the Late Pleistocene occurred prior to the Last Glacial Maximum (LGM), but that this outermost stadial position (local LGM) was reached on not just one, but several occasions between MIS (marine isotopic stage) 5b (or MIS 4) and MIS 3. Some preliminary results also document major glacier fluctuations during MIS 3.