- Aamir Khan had cast Zaira Wasim, when she was aged 14, in Dangal (2016). Shortly afterwards, Advait told Khan that he was looking for a girl of a similar age for the lead role of his film Secret Superstar, and Khan suggested Wasim. After Advait tested her, he was impressed and cast her in the lead role.
- The principal photography of the film commenced on 1 September 2016. The film is shot in Vadodara and Mumbai.
- The film was produced with a limited budget. Most sources state the production budget is ₹15 crore (US$2.3 million). Rob Cain gives the film’s total production and marketing budget as ₹25 crore (US$3.84 million). Box Office India gives its budget as ₹45 crore (US$6.91 million), but it is not known if this includes marketing costs.
- Zaira Wasim won the National Child Award for Exceptional Achievement.
- Secret Superstar received ten nominations at the 63rd Filmfare Awards, including Best Film, Best Director for Chandan, Best Actress for Wasim, and Best Supporting Actor for Khan.
- It won three Filmfare Awards, including Best Actress (Critics) for Wasim, Best Supporting Actress for Vij, and Best Playback Singer (Female) for Meghna Mishra.
- Secret Superstar serves as the second collaboration between Wasim and Khan following Dangal (2016).
- Secret Superstar became one of the most profitable films of all time, grossing ₹858 crore ($154 million) worldwide on a limited budget of ₹15 crore (US$2.3 million), with over 5,720% return on investment (ROI).
- The film is also the highest-grossing Indian film featuring a female protagonist, the highest-grossing 2017 Hindi film, the seventh highest-grossing Indian film worldwide, and the second highest-grossing Indian film overseas. In China, it is the fifth highest-grossing foreign film of 2018, and the second highest-grossing non-English foreign film ever (after Dangal).