Ryan Sinclair is a fictional character from the British television series Doctor Who. He first appeared in the show's eleventh series, portrayed by actor Tosin Cole. Ryan is known for his friendly and adventurous personality, often serving as a companion to the Thirteenth Doctor, played by Jodie Whittaker. In the series, Ryan has a background in working as a warehouse employee and has a close relationship with his friends, including Yasmin Khan and Graham O'Brien. His character explores themes of friendship, bravery, and personal growth throughout their travels in time and space.