Marcols-les-Eaux (French pronunciation: [maʁkɔl le.z‿o]; Occitan: Marcols) is a commune in the Ardèche department of southern France.

Known as Marcovolos during the 11th century and then Marcouls during the 12th century, the village became Saint-Julien-d'Ursival (first mentioned in 1573), Saint Julian the Hospitaller being the patron of the town. In 1790, the village is renamed Marcols by the revolutionaries willing to remove any references to the Catholic Church. In 1912, the town becomes Marcols-les-Eaux as many mineral water sources are found throughout the village. A source was exploited for bottled mineral water until the late 1950s. In 1912, 36% of the commune's territory are detached to form the new town of Albon-d'Ardèche.

On 4 November 1943, an airplane of the British Royal Air Force, dropping guns and munitions to the local Resistance during the night, crashes against the Bourboulas pike, in Marcols-les-Eaux. 7 of the 8 crew members died. They were buried the next day in the village cemetery by the inhabitants. Their tombstones are still visible.

On 7 August 1944, the German Luftwaffe, suspecting the inhabitants of supplying the local Resistance with food, bombs the village several times during the day killing three local civilians and destroying a couple of farms and houses. A plate commemorating this bloody event was inaugurated along the wall of the commune's cemetery.

Until 1912, the two communes of Marcols-les-Eaux and Albon-d'Ardèche formed a single commune named Marcols.

Historical population

Year	Pop.	±% p.a.
1968	454	—
1975	353	−3.53%
1982	325	−1.17%
1990	300	−1.00%
1999	301	+0.04%
2009	337	+1.14%
2014	311	−1.59%
2020	279	−1.79%
Source: INSEE

• 
  A cross in the village
• 
  The Royal Air Force's crewmembers' tombstones in the village's cemetery

• Communes of the Ardèche department