The Doctor has had 29 different companions since the program's launch in 1963. There are also many other characters who may or may not be classed as 'full-time' companions.
The Companions of Doctor Who was created in 1986.
They have all had multiple companions, apart from the eighth Doctor in the Doctor Who movie.
The sixth Doctor's companions were Peri Brown and Melanie Bush.
In the revived series (2005 to the current series), two companions have fallen in love with the Doctor. The first is Rose Tyler (she proclaims her love for him at the end of SE2EP13: Doomsday) and the second is Martha Jones.
the most popular doctor who companions are Amelia Pond, Clara Oswald, and Rose Tyler
You can find a list in the Wikipedia article "Companion (Doctor Who)". Decide for yourself which ones you want to include - some were with The Doctor only briefly.
The Doctor has had many companions over the years in the TV show "Doctor Who." Some of the most notable companions include Rose Tyler, Martha Jones, Donna Noble, Amy Pond, and Clara Oswald. Each companion brings a unique dynamic to the Doctor's journey through time and space.
The Doctor's companions in 2011 will be Amy and Rory.
3 doctors did - the 1st, the 5th and the 10th.
The Twelfth Doctor, portrayed by Peter Capaldi, had several notable companions during his tenure from 2013 to 2017. His primary companions were Clara Oswald, played by Jenna Coleman, and Bill Potts, portrayed by Pearl Mackie. He also had brief interactions with other characters, including Nardole, played by Matt Lucas, who appeared alongside him in the later episodes. Overall, while Clara and Bill are the main companions, Nardole and others contributed to the Doctor's adventures.
The eleventh Doctor will star in The Sarah Jane Adventures along with the third Doctor's companion Jo Grant, apart from that there are no plans to bring any former companions back to Doctor Who.
The fifth Doctor (Peter Davison) traveled with three companions at once, Tegan, Nyssa and Adric from Castrovalva through to Earthshock.