Bic Company of France marketed the first disposable razor worldwide in 1975. The razor used a plastic handle containing a single blade designed for a single use shave.

Additional Information:

• Safety razor – Wikipedia
  In 1974 Bic introduced the disposable razor. Instead of being a razor with a disposable blade, the entire razor was manufactured to be disposable. Gillette’s response was the Good News disposable razor which was launched on the US market in 1976 before the Bic disposable was made available on that market.
• Société Bic – Wikipedia
  Société Bic S.A., commonly referred to simply as Bic and stylized as BiC, is a corporation based in Clichy, France, best known for making disposable consumer products such as lighters, razors, mechanical pencils, …. “The Razor Blade: History’s Cutting Edge : Culture: Scientists know that ancient man shaved. But the razor …
• HOW BIC LOST THE EDGE TO GILLETTE – The New York Times
  Apr 11, 1982 – So Bic hit at the heart of Gillette’s profit-making center – razors and blades – with a disposable single-edged razor. The effort foundered for a …
• Shavers | BicWorld
  BIC’s shaver collection is made with both men and women in mind and offers technological innovations at a fair price.