The Inbestigators (stylised as The InBESTigators) is an Australian mystery children's television series. The show stars Abby Bergman, Anna Cooke, Aston Droomer and Jamil Smyth-Secka as Ava Andrikides, Maudie Miller, Ezra Banks and Kyle Klimson, respectively. The characters are fifth-graders who solve crimes in their school and neighbourhood. Created by Robyn Butler and Wayne Hope, the series has the comic tone of Little Lunch (another series on which they had worked) and an air of mystery. The show aired in two series from 21 June to 30 November 2019 on ABC Me. Netflix released the first and second series in mid-2019 and early 2020 respectively.

The Inbestigators garnered critical acclaim, with praise for its humour and cast, though its characters drew mixed opinions. The show received two AACTA Award nominations for Best Children's Television Series. A spin-off web series, The InBESTigators: Crime Crack, was released in July 2019; a cast Q&A was released in late 2019, followed by a study guide during the COVID-19 pandemic.

The series is centred around Ezra Banks, a tech-savvy boy; Maudie Miller, a socially-awkward, intelligent aspiring private investigator; Ava Andrikides, an outgoing, dramatic girl; and Kyle Klimson, an athletic goof. They form the Inbestigators, a detective agency that solves crimes in their school and neighbourhood. After a case is solved, they describe it on a vlog.

The Inbestigators is based on an original idea by Robyn Butler. It was created by Butler and Wayne Hope, who are also known for Little Lunch. After the success of Little Lunch, Butler and Hope wanted to create another children's comedy. For The Inbestigators, they "took the comic tone of Little Lunch and married with it the private detective, mystery genre". Butler explained that she and Hope created the show as a reaction to the "world [they are] living in", which she considered toxic and affected children's viewpoints. In response, she decided to make a show about kids with "ethnic diversity and gender equity and respect and integrity and kindness" to encourage "something else" in children. Screen Australia head of production Sally Callan said, "It's vital that young Australians are able to see their country, their stories and hear their accent reflected on the screen ... The characters in The Inbestigators ... are distinctive and inclusive, and tell stories that are innovative and culturally significant." In June 2018, ABC and Screen Australia greenlit the series. Development was funded by the Australian Children's Television Foundation (ACTF) and ABC.

Writing for The Inbestigators, by Robyn Butler, Wayne Hope, Molly Daniels, Lisa Marie Corso, Maddy Butler, Jayden Masciulli and Bob Franklin, began in 2017. Butler and Hope instructed the writers to keep the scripts clear and simple without dumbing them down, and to ensure that the children's dialogue was child-like: "Rather than writing what was funny or nostalgic for them, they had to get into the bones of a 10-year-old."

After the scripts were written, the team began to focus on the main cast; they sought talent and confidence. After 715 auditions, newcomers Aston Droomer, Anna Cooke, Abby Bergman and Jamil Smyth-Secka were cast as Ezra Banks, Maudie Miller, Ava Andrikides and Kyle Klimson. The series used many children in guest roles, most of whom had auditioned for the main roles. Cooke heard about auditions for The Inbestigators through her school newsletter. She thought it "looked [like] fun", and attended "three or four auditions". For the role, she cut her hair short. In the auditions, Bergman learnt and performed lines for the casting agency. She attended four auditions, the last of which was the chemistry read. Droomer's agency, Emma Raciti Management, sent an audition request for his role in The Inbestigators. Before the first audition, he needed to learn two scripts; for the following auditions he learnt more scripts, met with the series' creators and did a chemistry read.

The Inbestigators used a single-camera setup. To create 40 episodes, the production team required outside funding, which Netflix provided. Production was originally scheduled for July to November 2018. Filming began on 19 July 2018 at Moorabbin Primary School in Melbourne, and the wrap date was pushed back to December. The children worked for eight hours a day, with ten-minute breaks each hour and tutoring on set. Filming wrapped in November. Dan Maxwell was the series' photography director, and Simon McCutcheon was its production designer. The creators originally wanted to create the detective-agency set at their Port Melbourne production office; realising that travel would be difficult, however, they built it in the staff car park. Episodes were not filmed chronologically; scenes at the same location were shot together. There was a one-week break between filming of the first and second series. They needed to be filmed simultaneously due to the child actors' rapid growth.

The Inbestigators focusses on themes of honesty, loyalty, kindness, friendship, teamwork and responsibility. According to TV Tonight, instead of "nasty adult vices", the show's crimes are justified by desires to fit in or avoid loneliness. When caught, culprits apologise and learn a lesson or moral, which, according to Common Sense Media, are pertinent to tweens.