Cap-d'Ail (French pronunciation: [kap daj]; Occitan: Caup d'Alh; Italian: Capodaglio or Capo d'Aglio) is a seaside commune in the Alpes-Maritimes department in the Provence-Alpes-Côte d'Azur region in Southeastern France.

Cap-d'Ail borders the areas of La Colle, Les Révoires and Fontvieille in the Principality of Monaco.

Contemporary Cap-d'Ail is a modern seaside resort with a lively shopping district on the Basse Corniche and quiet, fashionable residential areas. Many people who work in Monaco live there. Plage Mala is prized by many day trippers from Monaco and Nice.

Cap-d'Ail is served by a 1881 station on the Marseille–Ventimiglia railway, the last before the Monégasque border.

The Stade Didier Deschamps is located down the street from the Monaco border and Stade Louis II, and as such often hosts matches in Monaco's national amateur company football tournament Challenge Prince Rainier III and used to host the matches of the Monaco national football team as of 2017. The stadium is also home to US Cap d'Ail Football who play in District 1 Côte d'Azur (Tier 9) as of the 2024-25 season..

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  Coastline in Cap-d'Ail
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  Cap-d'Ail from the sea
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  Château des Terrasses
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  Sea cliffs

On 13 September 1982, Princess Grace de Monaco was killed in a car accident.

Historical population

Year	Pop.	±% p.a.
1968	4,200	—
1975	4,282	+0.28%
1982	4,402	+0.40%
1990	4,859	+1.24%
1999	4,532	−0.77%
2009	5,024	+1.04%
2014	4,711	−1.28%
2020	4,517	−0.70%
Source: INSEE

• Communes of the Alpes-Maritimes department