Recurring
Daphne Keene (Daffany Clark) is Callie's close friend who she meets in juvie and later lives with at Girls' United. She begins working for Justina, the investor in Fost and Found, to win back custody of her daughter.
Timothy (Jay Ali) is a teacher, who is quite popular among his students at Anchor Beach Community Charter School.
Ana Gutierrez (Alexandra Barreto) is Jesus and Mariana's biological mother, and a member of AA. In the first season, Ana initially bribes Jesus and Mariana for money. She later dates Mike and also gives birth to a daughter, Isabella, during the third season and becomes engaged to Mike in season five.
Dana Adams (Lorraine Toussaint) is Lena's mother.
Stewart Adams (Stephen Collins in Season 1, Bruce Davison in Season 3) is Lena's father.
Emma Kurtzman (Amanda Leighton) is a member of the wrestling and STEM teams with Mariana. She becomes Jesus' girlfriend before they break up but are reconciled in season 3.
Sophia Quinn (Bailee Madison) is Callie's biological younger half-sister. Sophia clings on to Callie as though they are really close despite only meeting each other recently, even acting out after Callie makes it clear to her and her family that she does not want to live with them. After she attempts suicide and goes to counseling, Sophia's parents discover that she has a personality disorder, which her father discloses to Callie.
Mat Tan (Jordan Rodrigues) is a founding member of Someone's Little Sister. Since the second season, he and Mariana have been dating each other only to find themselves constantly breaking up and getting back together again.
Monte Porter (Annika Marks) is the principal of Anchor Beach Community Charter School. Monte is divorced and in Lena's office at school, she briefly kisses Lena. By the third season, Monte begins dating Jenna after revealing that she is reevaluating her sexual orientation.
Taylor (Izabela Vidovic) is Jude's friend and classmate.
AJ Hensdale (Tom Williamson) is an adolescent boy whom Mike is potentially expecting to adopt, but Mike initially has Stef and Lena foster him for a short while. While staying over the Adams Foster household, AJ and Callie start dating and they later kiss before he runs away with his brother, Ty, as the latter commits a crime. This only leads to AJ being sent to juvie while his brother goes under arrest. Following his release from juvie (as the court determines his brother is not guilty), he and Callie continue with their relationship.
Cortney Strathmore (Denyse Tontz) is Brandon's ex-girlfriend, and is three years his senior. She also has a very young son and is going through a divorce so Brandon lived with Cortney and helped pay off her house rent.
Nick Stratos (Louis Hunter) is Jesus' friend and Mariana's unstable boyfriend. In the fourth season, Stef and Mike discover that Nick had set the warehouse on fire, and then they realize that he has fled from school with his father's gun; the school subsequently goes on lockdown. When Callie finds him holding Mariana hostage in her bed the next morning, Stef has him sent to prison. Following Nick's release from a psychiatric hospital, the court places a restraining order on him. However, during the neighborhood's celebration for Callie potentially passing her new foster care bill, Mariana sees Nick walking in the crowd without realizing that she is only hallucinating, a side effect resulting from taking Jesus's ADHD medication. Fearing her safety is at risk, she subsequently calls Jesus before running away. Jesus then contacts Nick, who is alone at his house, demanding that he release Mariana but Nick makes it clear that he is not with her. Not believing him, Jesus goes searching for Nick, where he later finds him having an argument with Mariana. Acting on impulse, Jesus attempts to beat him up only to find himself being attacked to the ground, which is when Stef abruptly appears trying to stop their fight. Nick then provides Jesus with a blow to the head before he immediately loses consciousness.
Gabriel "Gabe" Duncroft (Brandon Quinn) is Jesus and Mariana's biological father, who is on a sex offenders list for being 18 when dating only 15-year-old Ana. At the time, her parents filed a restraining order against him, which led to his subsequent arrest. Years later, Jesus meets Gabe while helping him on a construction site without initially disclosing that he is his son. Gabe later assists Brandon in setting up his school musical, but after the board of directors at Anchor Beach learn about Gabe's background, Lena is at risk of losing her job so she, alongside Stef, Mike, and a lawyer help remove Gabe off the list.
Aaron Baker (Elliot Fletcher) is a law student who helps Callie release her younger ex-foster brother out of jail as the latter has been falsely accused of murdering an elderly woman that he had worked for. He later reveals he is transgender and becomes Callie's boyfriend in season five.
Noah (Kalama Epstein) is Jude's second boyfriend whom he meets at Taylor's church youth group. After Jude discovers that Noah has marijuana to help him with his anxiety, he convinces Jude to eat his medical marijuana gummy worms with him and they later find themselves smoking marijuana frequently to get high together. However, after the two are caught smoking it one night in the family's garage, Stef and Lena forbid Jude from seeing Noah again. Stef and Lena later encourage the relationship because of how much Jude is affected by Callie going to jail.
Grace (Meg DeLacy) is Brandon's girlfriend. She volunteers at the hospital, where she uses music therapy for children with autism. Grace is diagnosed with leukemia and undergoes chemotherapy, which is unsuccessful. She becomes mad after finding out that her mother discloses her condition to Brandon. She becomes irritated after her mother restricts her from having sex with Brandon.
Rita Hendricks (Rosie O'Donnell) is the leader of Girls United – a group home for troubled girls – who befriends Callie.
Jack Downey (Tanner Buchanan) is a socially inept teenager, who befriends Jude after meeting him at a foster youth event where Callie was a speaker. Jack later catfishes Callie by pretending to be AJ and ends up kissing Jude because he wanted to make him feel better, however he later tells Callie he is not gay. Callie and Jude's previous abusive foster father beats Jack to death after Jack's attempt to call a police operator for help.
Justina Marks (Kelli Williams) is the lobbyist whom Callie initially collaborates with on a bill that will repair the issues currently facing foster care legislation in the state. After realizing the intent of the bill, which privatizes foster care, is to only worsen things for the sake of Justina and her company earning a profit, Callie takes a photo online of the check Justina receives in the mail in her office at work so this becomes visibly known to the public. Callie, then, decides to compete against Justina by designing her own bill that will genuinely improve the lives of those in foster care. Nonetheless, in the midst of Callie's celebration party, one of Justina's workers informs Callie that if she goes through on passing her bill, Justina will have Callie sent to prison by disclosing to the police how she read through her mail, thereby allowing her own bill to gain approval instead.
Talya Banks (Madisen Beaty) is Brandon's initial girlfriend; they break up after she discovers his feelings for Callie.
Lexi Rivera (Bianca A. Santos) is Mariana's best friend, and Jesus' girlfriend. Lexi moves to Honduras before residing back in San Diego after she and her family get their visas. When returning to Anchor Beach, Lexi finds out that while she was away, Emma was on the wrestling team where she met and later started dating Jesus. Lexi later reads the email that Jesus sent to her, leading to Lexi breaking up with him.
Wyatt (Alex Saxon) is Callie's first boyfriend, with whom she runs away. He later returns during the second and third season before they break up. He starts to date Mariana a couple of days or months after he took her virginity while she was dating Mat. He appears in season five being toyed by Mariana in a few episodes.
Connor Stevens (Gavin MacIntosh) is Jude's best friend, classmate and first boyfriend. The two have problems in their relationship, mostly due to Connor's homophobic father and Jude's refusal to label himself as gay, but they work through them. In season 3, Connor and Jude admit they love each other but the pair break up after struggling to maintain a long-distance relationship following Connor's permanent move to his mother's house in Los Angeles.
Frank Cooper (Sam McMurray) is Stef's father, who is not fond of his daughter's sexual orientation. Despite being homophobic, Frank decides to attend Stef's wedding but she disinvites him the night before marrying Lena. A few days later, Stef finds him dead on the couch at her parents' house only to later regret missing out on potentially relieving the tensions she had with her father.
Kiara (Cherinda Kincherlow) is one of Callie's friends from Girls' United.
Cole (Tom Phelan) is a transgender boy from Girls' United, who Callie escorts to prom.
Dani (Danielle) Kirkland (Marla Sokoloff) is Mike's girlfriend whom he met at AA. Brandon, later, discloses to his parents and step-mother that after returning to his father's house drunk one night, Dani took advantage of and had sex with him. The next morning, Mike has broken up with her, the police came to arrest Dani at Mike's house for statutory rape.
Donald Jacob (Jamie McShane) is Jude's biological father who initially raised Callie and Jude with their late mother. One night, however, he drove drunk with his wife in the car before getting into an accident which killed her instantly. He was subsequently arrested for quite some time so Callie and Jude ended up in the foster care system. Donald later signs the papers in court that would allow Stef and Lena to adopt Jude.
Hayley Heinz (Caitlin Carver) is Jesus's second girlfriend and a member of the school dance team. Before the pair break up, Jesus tattoos her name on the side of his chest, and after their split, his parents find out about his tattoo and have him laser it off.
Robert Quinn (Kerr Smith) is Callie's biological father. It was not until the court discovers his name on Callie's birth certificate that they realized Robert—not Donald—was her biological father. Against Callie's wishes, Robert initially fights for her custody before realizing that it would not be in Callie's best interest, and instead gives up his parental rights to Stef and Lena.
Adam Stevens (Chris Bruno) is Connor's abusive and homophobic father. He finds Connor's homosexuality uneasy to bear and disapproves of his son's relationship with Jude.
Lucy "Lou" Chan (Ashley Argota) is Brandon's former love interest, and a member of the band Someone's Little Sister.