Didier Billet (; 17 August 1958 – 14 September 2026) was a French footballer who played as a goalkeeper.

Billet started his career with RC Agde in 1968, also playing for Olympique Marseille, Olympique Alès, and CS Alençon before retiring with Agde in 1987. In international play, he appeared in two matches for the France U-20 team in the 1977 FIFA World Youth Championship.

Billet died on 14 September 2026, at the age of 68.

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