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Olivia M. Lamasan is a Filipina television and film director, writer and producer known for her works such as Sana Maulit Muli and Madrasta which were both successful.
Lamasan is the head of ABS-CBN's Creative Department, and is referred to as master director due to her expertise and excellence in her field. She is often called Inang by her colleagues.
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| Movie | 1986 | I Love You Mama, I Love You Papa | Clerk of Court | |
| Movie | 2025 | Only We Know |
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| Movie | 2019 | Quezon's Game | Producer | Production |
| Movie | 2009 | In My Life | Director | Directing |
| Movie | 2004 | Milan | Director | Directing |
| Movie | 2012 | The Mistress | Director | Directing |
| Movie | 2012 | The Mistress | Story | Writing |
| Movie | 2020 | Fan Girl | Executive Producer | Production |
| Movie | 2014 | Starting Over Again | Director | Directing |
| Movie | 2020 | Boyette: Not a Girl Yet | Executive Producer | Production |
| Movie | 2021 | Love or Money | Executive Producer | Production |
| Movie | 1989 | When Will Sin Be Washed Away? | Line Producer | Production |
| Movie | 2019 | The Mall, The Merrier | Executive Producer | Production |
| Movie | 2018 | DOTGA: Da One That Ghost Away | Executive Producer | Production |
| Movie | 2018 | Fantastica | Executive Producer | Production |
| Movie | 2018 | Kusina Kings | Executive Producer | Production |
| Movie | 1987 | Shoot That Ball | Associate Producer | Production |
| Movie | 1995 | Second Chances | Story | Writing |
| Movie | 1995 | Second Chances | Screenplay | Writing |
| Movie | 1994 | Maalaala Mo Kaya: The Movie | Screenplay | Writing |
| Movie | 1995 | Second Chances | Director | Directing |
| Movie | 1994 | Maalaala Mo Kaya: The Movie | Director | Directing |
| Movie | 1996 | The Stepmother | Screenplay | Writing |
| Movie | 1996 | The Stepmother | Director | Directing |
| Movie | 2011 | In the Name of Love | Director | Directing |
| Movie | 2011 | In the Name of Love | Screenplay | Writing |
| Movie | 2004 | Milan | Screenplay | Writing |
| Movie | 2014 | Starting Over Again | Story | Writing |
| Movie | 2014 | Starting Over Again | Screenplay | Writing |
| Movie | 1986 | I Love You Mama, I Love You Papa | Production Supervisor | Production |
| Movie | 1997 | Hanggang Kailan Kita Mamahalin? | Director | Directing |
| Movie | 1997 | Hanggang Kailan Kita Mamahalin? | Story | Writing |
| Movie | 1995 | As Long As We're Together | Screenplay | Writing |
| Movie | 1998 | Kay Tagal Kang Hinintay | Screenplay | Writing |
| Movie | 1995 | Mangarap Ka | Story | Writing |
| Movie | 1996 | In My Own Hands | Story | Writing |
| Movie | 2000 | Minsan, Minahal Kita | Story | Writing |
| Movie | 2000 | Minsan, Minahal Kita | Director | Directing |
| Movie | 2002 | Got 2 Believe | Screenplay | Writing |
| Movie | 2002 | Got 2 Believe | Director | Directing |
| Movie | 1993 | Ligaw-Ligawan, Kasal-Kasalan, Bahay-Bahayan | Production Supervisor | Production |
| Movie | 2023 | Mama Susan's Friends | Executive Producer | Production |
| Movie | 1992 | Mahal Kita, Walang Iba | Screenplay | Writing |
| Movie | 1992 | Lumayo Ka Man sa Akin | Screenplay | Writing |
| Movie | 2009 | In My Life | Story | Writing |
| Movie | 2009 | In My Life | Screenplay | Writing |
| Movie | 1991 | Ipagpatawad Mo | Screenplay | Writing |
| Movie | 2016 | Barcelona: A Love Untold | Director | Directing |
| Movie | 1990 | Heaven's Judgment | Line Producer | Production |
| Movie | N/A | Elena 1944 | Director | Directing |
| Movie | 1992 | Mahal Kita, Walang Iba | Story | Writing |
| Movie | 2018 | The Girl in the Orange Dress | Executive Producer | Production |
| Movie | 2019 | Alone/Together | Executive Producer | Production |
| Movie | 2019 | Between Maybes | Executive Producer | Production |
| Movie | 2018 | The Wedding | Executive Producer | Production |
| Movie | 2019 | Hello, Love, Goodbye | Producer | Production |
| Movie | 2020 | Death of Nintendo | Executive Producer | Production |
| Movie | 2019 | The Panti Sisters | Executive Producer | Production |
| Movie | 2019 | Isa Pa, with Feelings | Executive Producer | Production |
| Movie | 2020 | U-Turn | Executive Producer | Production |
| Movie | 2020 | My Lockdown Romance | Executive Producer | Production |
| Movie | 2018 | The Hows of Us | Executive Producer | Production |
| Movie | 2020 | Four Sisters Before the Wedding | Executive Producer | Production |
| Movie | 2020 | James & Pat & Dave | Executive Producer | Production |
| Movie | 2024 | Hello, Love, Again | Story | Writing |
| Movie | 2005 | Can This Be Love | Script Consultant | Writing |
| Movie | 1990 | Bullet and Rosary | Screenplay | Writing |
| Movie | 1991 | Ganti ng Api | Line Producer | Production |
| TV Show | 2020 | The House Arrest of Us | Executive Producer | Production |
| TV Show | 2021 | He's Into Her | Executive Producer | Production |
| TV Show | 2022 | Tara, G! | Executive Producer | Production |
| TV Show | 2014 | Forevermore | Writer | Writing |
| TV Show | 2002 | Kay Tagal Kang Hinintay | Director | Directing |
| TV Show | 2013 | Got to Believe | Creator | Creator |
| TV Show | 2016 | Dolce Amore | Creator | Creator |
| TV Show | 2018 | Bagani | Creator | Creator |
| TV Show | 2018 | Two Hearts | Creator | Creator |
