BlaBlaCar is a French online marketplace for carpooling headquartered in Paris. Its website and mobile apps connect drivers and passengers willing to travel together between cities and share the cost of the journey, in exchange for a commission of between 18% and 21%. It also operates BlaBlaCar Bus, an intercity bus service. The platform has 26 million active members and is available in Europe and Latin America.

The service is named for its rating scale for drivers' preferred level of chattiness in the car: "Bla" for not very chatty, "BlaBla" for someone who likes to talk, and "BlaBlaBla" for those who can't keep quiet.

In December 2003, Frédéric Mazzella wanted to travel from Paris to visit his family in the French countryside for Christmas, but he did not own a car and the trains were fully booked. After his sister made a 150-kilometer detour to collect him, he noticed that most cars going in his direction did not have any passengers. During nights and weekends, he began working on creating a concept to address the issue. In 2006, he bought a website called Covoiturage.fr, French for "carpooling", created in 2004. By September 2008, it was the largest carpool website in France.

In June 2011, it introduced BlaBlaCar.com in the United Kingdom.

In June 2012, an online reservation service was added to Covoiturage.fr. The web service put in place its business model and began to make profits. It was also a way to attract drivers and to reach the critical mass. Between July and November, Comuto expanded to Italy, Portugal, Poland, Netherlands, Luxembourg, and Belgium.

In April 2013, BlaBlaCar was launched in Germany. Covoiturage.fr was re-branded BlaBlaCar.fr.

In January 2014, BlaBlaCar was introduced in Ukraine and Russia. As of June 2024 BlaBlaCar is still offering its services in Russia.

In September 2014, the service had 10 million users.