2012

Mahi made her acting debut with Bhalobasar Rong in 2012, opposite to another debutante Bappy Chowdhury.^[13] Bhalobashar Rong is referred as the first Bangladeshi digital cinema according to Jaaz Multimedia. The film was declared^{[by whom?]} as a huge financial success.^[14]

2013

In 2013, Mahi appeared in four films. Her first release was Onnorokom Bhalobasha. Again opposite to Bappy Chowdhury. Her next release was PoraMon, opposite to Symon Sadik.^[15] She was reported as "a new sensation" by all Bangladeshi media.^[16][17] The Daily Ittefaq and Asian TV program Movie Bazaar has declared Mahi as the best actress of 2013.^{[18][19][20][21][22]}

Her third film of the year marked her first collaboration with actor Shakib Khan as they were paired up in Bhalobasha Aaj Kal for the first time. The couple was received positive response from the audience and also the film received positive reviews and became as a superhit at box office upon release.^[23][24] Also, was highest-grossing film of Jaaz Multimedia production till Shikari (2016) released. The Daily Star noted about the film, "The Shakib Khan and Mahiya Mahi duo was adorable".^[25] New Age reported, "'Shakib-Mahi duo is very well-matched. Paired up with heartthrob Shakib Khan, Mahi won the hearts of the film lovers through her acting in Bhalobasha Aaj Kal".^[26][16] Her last release was Tobuo Bhalobashi, once again opposite to Bappy Chowdhury.

2014

Mahi's first release in 2014 is Ki Darun Dekhte.^[27] Her next and long-awaited movie Agnee, opposite to Arifin Shuvoo, is a women-centric crime thriller film.^[28][29] It became one of the most commercially successful films in Dhallywood history.^[30][31][32] Agnee brought Mahi 'Best Film Actress ' for the 1st time from Meril Prothom Alo Awards in 2014.^[9]

Dobir Saheber Songsar is the first comedy movie performed by Mahi. She played three roles at a time in this movie. It did average in the box office. Her Next film is "Honeymoon" with Bappy Chowdhury and director by Shafi Uddin Shafi. Honeymoon relies time of eid ul fitr & production house of Jaaz Multimedia.^[33]

Onek Sadher Moyna released on 7 November. It is the remake of film 'Moyna-Moti' of 1969 played by the legends Abdur Razzak and Kabori. The film did excellent in the box office.^[34][35]

In the film Desha: The Leader, Mahi plays the role of a journalist, opposite Shipan Mitra. For the first time she will be found as a lyricist in this movie.^[36][37]

2015

In 2015, she starred as Juliet in Romeo vs Juliet opposite Joey Debroy and Ankush Hazra, directed by Ashok Pati. She played the title role in Shafi Uddin Shafi's Big Brother, opposite Shipan Mitra and played the role of a journalist in Warning, opposite Arifin Shuvoo. Mahi also starred in Agnee 2, the sequel to Agnee. She became the brand ambassador of Unilever's beauty brand Fair & Lovely in April 2014.^[38]

2020-present

In late 2020, she played as an advocate in the Anonno Mamun's fictional courtroom drama Nabab LLB.

In 2024, she collaborate with Shakib Khan after 4 year of Nabab LLB (2020) with an extended cameo appearance as 65-year-old Khan's mother in Himel Ashraf's melodrama Rajkumar. Mahi's character received mixed reviews upon its release.^[39]

Short films

Web series

Music video