Olivier Toussaint is a French composer, pop singer, orchestra arranger, company manager, and record producer.

He started a partnership with the French composer, Paul de Senneville in 1968. In 1976, they discovered Richard Clayderman, and established him as the top French record seller worldwide more than 65 millions of LPs sold. "Ballade pour Adeline", composed by Paul de Senneville and Olivier Tousaint, was the first song recorded by Richard Clayderman at Delphine studio, and it sold over 22 million singles in 38 countries through the years 1977 to 1979.

In 1978, he was chosen to represent Monaco alongside French singer Caline and together they finished in 4th place overall.

In 1983, with the song "Eden Is a Magic World", Olivier Toussaint got to #1 in the charts in France, Switzerland and Belgium.

Since then, he has been the main manager of Delphine Productions, looking after over 40 employees and artists. Besides producing and recording music for several international instrumentalists such as Richard Clayderman, Nicolas de Angelis, and Ocarina Group, Delphine activities are in instrumental and advertising film and clip production.