Pic du Montaigu, Mountain summit in Hautes-Pyrénées, France.

Pic du Montaigu is a 2,339-metre summit in the French Pyrenees, in Bigorre, Hautes-Pyrénées. It is a forward peak of a ridgeline, with pale grey rock and snow patches in gullies on its upper slopes, and forested flanks below. A marble memorial plaque to David Casnabet is set at the summit.

The sources record no documented first ascent or dated historical events for Pic du Montaigu; its written history is limited to its Occitan place name, mountagut, meaning "sharp mount", and to its position above the commune of Bagnères-de-Bigorre in the Hautes-Pyrénées. The marble memorial plaque at the summit, dated 1968–2010, is the only dated trace the sources mention.

The name derives from the Occitan "mountagut", meaning "sharp mount", referring to the pointed crest. At the summit, a marble plaque commemorates David Casnabet (1968–2010), and small ex-votos such as a Lourdes Virgin are placed in rock crevices.

From the Chiroulet hamlet in the Lesponne valley, the summit is about five hours of walking, with two hours to the Magenta waterfall on the way. The other approach starts at the Col du Moulata car park and follows the crests past the Col de Barran (1934 m) for three to four hours, with the pics de Barran and du Mont as optional detours.

A marble memorial at the summit honors David Casnabet, and votive objects are tucked within rock crevices. These personal items left by visitors tell stories of many who have reached this spot over time.