John Finnegan is a fictional character from The Bold and the Beautiful, an American soap opera on the CBS network, portrayed by Tanner Novlan. Created by executive producer Bradley Bell in 2020, Finn made his first appearance on July 23 of that year, and is introduced as the doctor who treats Steffy Forrester (Jacqueline MacInnes Wood) after she sustains injuries in a motorcycle accident and develops a dependency to her pain pills. In addition to the character's presence as part of an opioid addiction storyline, Finn evolved and became Steffy's love interest, subsequent to the pair meeting originally when she landed at the hospital, and both experiencing an immediate attraction to one another and, essentially, fell in love at first sight. Months later, Finn impregnates Steffy, the duo gets engaged, and then delivers their son, Hayes Finnegan, via home birth. They later marry one another in an intimate ceremony at the Forrester Estate. Finn is later revealed to be the long-lost son of the nefarious villainess Sheila Carter (Kimberlin Brown). Finn is the product of an illicit sexual relationship between Sheila and Jack Finnegan (Ted King) while he was married to Finn's adoptive mother, Li Finnegan (Naomi Matsuda). Unbeknownst to Li and Finn, Sheila gave Finn up as a newborn and Jack arranged a secret adoption of his own biological son in order to keep his affair secret. TV Source Magazine acclaimed Finn as a "strapping young doctor" who infused "a breath of fresh air" to the show; Carly Silver from Daytime Confidential asserted that the character was a "good seed". Commonly referred to by the portmanteau "Sinn" in magazines, on social media and internet message boards, the pairing of Finn and Steffy attracted a large fan following. Novlan has become popular with viewers and his introduction and performance in the role have received much praise from critics.