Kent Cheng Jak-Si (Chinese: 鄭則士, born 22 May 1951) is a Hong Kong film and television actor. He is a two time recipient of the best actor award at the Hong Kong Film Awards.
| Movie | A Gilded Game | Mike | 2025-05-01 |
| Movie | Crisis Negotiators | Lam Ka Cheung | 2024-05-24 |
| Movie | Cesium Fallout | Secretary for Security | 2024-10-25 |
| Movie | Triad 2 | Mr. Wong | 2023-10-05 |
| Movie | I Did It My Way | Uncle Cat | 2023-12-29 |
| Movie | Once Upon a Time in Hong Kong | Pudgy | 2021-04-29 |
| Movie | All U Need Is Love | Wong Tai Ho's father | 2021-04-22 |
| Movie | Guilt by Design | Liang Sir | 2019-09-12 |
| Movie | The White Storm 2: Drug Lords | Yu Nam | 2019-07-04 |
| Movie | Ip Man 4: The Finale | Bob | 2019-12-19 |
| Movie | The Leakers | Teo Jit Sin | 2018-06-15 |
| Movie | Chasing the Dragon | Piggy | 2017-09-28 |
| Movie | Return of the Cuckoo | Chan Man San | 2015-11-12 |
| Movie | Ip Man 3 | Detective Po | 2015-12-24 |
| Movie | Who Is Undercover | Yu Dachuan | 2014-12-31 |
| Movie | Good-for-Nothing Heros | 2012-03-08 | |
| Movie | Sleepwalker | Eric's brother | 2011-10-23 |
| Movie | Ip Man 2 | Fatso | 2010-04-29 |
| Movie | Run Papa Run | Uncle Lone - Elder #2 | 2008-04-10 |
| Movie | Out of Control | Zhang Heng | 2008-11-07 |
| Movie | Flash Point | Wong | 2007-07-26 |
| Movie | My Heart Will Go On | Li Tee | 2001-01-01 |
| Series | Asian Charlie's Angels | Unknown | 2001-01-01 |
| Movie | Casino | Inspector To | 1998-05-06 |
| Movie | Mad Stylist | 1997-04-11 | |
| Movie | The Stunt Woman | Blackjack | 1996-10-10 |
| Movie | The Log | Officer Gump | 1996-06-13 |
| Movie | Hong Kong Graffiti | Mr Seven | 1995-03-04 |
| Movie | Bomb Lover | Inspector Seito | 1995-01-14 |
| Movie | Those Were the Days... | Wah's Father | 1995-04-22 |
| Movie | Heaven Can't Wait | Tsui Dai Bo | 1995-07-28 |
| Movie | The Most Wanted | Supt Cheng Ming Fen | 1994-05-12 |
| Movie | Bloody Brothers | Yao Tai Chuan | 1994-05-13 |
| Movie | Wonder Seven | Nanny | 1994-04-01 |
| Movie | The Gods Must Be Funny in China | Fatty | 1994-03-31 |
| Movie | Hero of Hong Kong 1949 | Master Fok | 1994-06-03 |
| Movie | The Kung Fu Scholar | Unknown | 1994-01-13 |
| Movie | S.D.U. - Mission in Mission | Officer Chin | 1994-12-08 |
| Movie | Mermaid Got Married | Principal | 1994-11-10 |
| Movie | Once Upon a Time in China V | Porky Wing | 1994-06-18 |
| Movie | Ancient Chinese Whorehouse | Kong | 1994-09-15 |
| Movie | Beginner's Luck | Chow Sing Chi | 1994-09-29 |
| Movie | The Bodyguard from Beijing | Charlie Leung | 1994-07-28 |
| Movie | Let's Go Slam Dunk | Tin Yuen | 1994-07-16 |
| Movie | Lord Of East China Sea II | Huang Quanrong | 1993-05-13 |
| Movie | Lord Of East China Sea | Huang Quanrong | 1993-04-22 |
| Movie | Crime Story | Detective Hung Ting-Bong | 1993-06-24 |
| Movie | Run and Kill | Cheung | 1993-02-27 |
| Movie | Kidnap of Wong Chak Fai | Officier Chung Wai Ching | 1993-08-20 |
| Movie | A Roof with a View | Fat Ho | 1993-09-16 |
| Movie | Man of the Times | Detective Lau Fook | 1993-08-28 |
| Movie | Powerful Four | Ho Sum/Fatty B | 1992-01-01 |
| Movie | Fun and Fury | Ma | 1992-03-19 |
| Movie | Lethal Contact | Penguin | 1992-01-16 |
| Movie | Lucky Encounter | Fatty | 1992-06-10 |
| Movie | Dr. Lamb | Fat Bing | 1992-10-22 |
| Movie | The Prince of Temple Street | Cheng [cameo] | 1992-08-20 |
| Movie | Spiritual Trinity | Tien Kuei | 1991-01-01 |
| Movie | To Be Number One | Fat Kwan | 1991-04-15 |
| Movie | Legend of the Brothers | Hoi | 1991-11-20 |
| Movie | Once Upon a Time in China | Porky Wing | 1991-08-15 |
| Movie | Sex and Zen | Tin Chan | 1991-11-30 |
| Movie | The Spooky Family | 1990-02-23 | |
| Movie | The Fortune Code | Chocolate | 1990-01-19 |
| Movie | Ghost Legend | Chu Yi | 1990-11-16 |
| Movie | Family Day | Fatty Chow Fok Si | 1990-09-20 |
| Movie | Return of the Lucky Stars | Sgt Cheng | 1989-04-28 |
| Movie | Mr. Smart | Smart | 1989-03-03 |
| Movie | Vampire Buster | Cheung Sap Yat | 1989-06-08 |
| Movie | Little Cop | Yi's Butler | 1989-03-25 |
| Movie | Mr. Sunshine | Mai-Bao | 1989-07-13 |
| Movie | Run, Don't Walk | Sgt Leung | 1989-08-25 |
| Movie | Sentenced to Hang | Ma Yee-Charn | 1989-11-02 |
| Movie | Walk on Fire | Tang | 1988-06-24 |
| Movie | Carry On Hotel | Mr. Lau | 1988-07-02 |
| Movie | The Dragon Family | Uncle Po | 1988-08-25 |
| Movie | The Diary of a Big Man | Inspector Cheng | 1988-07-21 |
| Movie | The Beloved Son of God | Fat Cat | 1988-11-27 |
| Movie | Vampire's Breakfast | Liao Chi-Piao / Fat Piao | 1987-04-16 |
| Movie | Easy Money | Inspector Ken | 1987-08-20 |
| Movie | Heartbeat 100 | Sergeant Chu | 1987-05-21 |
| Movie | You're My Destiny | Policeman | 1987-11-16 |
| Movie | The Good, The Bad & The Beauty | Fatty | 1987-10-21 |
| Movie | Bionic Ninja | (archive footage) | 1986-06-18 |
| Movie | Lucky Stars Go Places | Fat Cat | 1986-06-20 |
| Movie | United We Stand | Canteen boss | 1986-10-10 |
| Movie | A Hearty Response | Policeman outside bank | 1986-10-30 |
| Movie | Cop Busters | 1985-01-24 | |
| Movie | Modern Detective | Cheng | 1985-03-22 |
| Movie | Why Me? | Fat Cat | 1985-10-29 |
| Movie | The Flying Mr. B | Zhu Yugan | 1985-03-28 |
| Movie | The Comedy | Fatso | 1984-01-05 |
| Movie | Wrong Wedding Trail | Shing Tai Shi | 1984-09-06 |
| Movie | Lifeline Express | Fatso Ng | 1984-12-28 |
| Movie | Beloved Daddy | 1984-10-26 | |
| Movie | The Trail | Captain | 1983-03-31 |
| Movie | Give Me Back | Q | 1983-01-13 |
| Movie | Struggle for Leader | 1983-04-21 | |
| Movie | The Accident | Fatty Cheng | 1983-01-27 |
| Movie | The Sensational Pair | Ko Kwai | 1983-06-23 |
| Movie | Mission to Kill | Unknown | 1983-06-02 |
| Movie | The Turning Point | 1983-10-04 | |
| Movie | Oh, My Cops! | Sgt Porky | 1983-07-20 |
| Movie | He Lives by Night | Dragon | 1982-05-08 |
| Movie | The Sweet and Sour Cops Part II | 1982-05-20 | |
| Movie | Torrid Wave | 1982-09-03 | |
| Movie | The Perfect Match | Captain Hsu Tang Tao | 1982-12-18 |
| Movie | The Man from Vietnam | 1982-12-03 | |
| Movie | Funny Boys | Zhang Bao | 1982-10-07 |
| Movie | The Mischievous Age | Male parent | 1981-02-19 |
| Movie | A Grand Statement | Policeman | 1981-01-16 |
| Movie | A Bride's Nightmare | Unknown | 1981-01-01 |
| Movie | Murderer Pursues | Uncle Su | 1981-06-26 |
| Series | The Misadventure of Zoo | Unknown | 1981-01-12 |
| Movie | The Sweet and Sour Cops | 1981-06-06 | |
| Movie | The Imp | Fatty | 1981-11-05 |
| Movie | Daughter & Father | Detective Cheng | 1981-07-09 |
| Movie | Mobfix Patrol | Fatso | 1981-10-29 |
| Movie | The Club | Kun | 1981-09-17 |
| Movie | The Emperor and His Brother | No. 8, Yang Seng Hip | 1981-07-19 |
| Movie | Disco Bumpkins | Director | 1980-02-15 |
| Movie | The Saviour | Nineteen | 1980-01-08 |
| Movie | The Informer | Detective Chang Bann | 1980-05-10 |
| Movie | Read Lips | Inspector | 1980-09-18 |
| Movie | Every Man for Himself | 1980-10-31 | |
| Movie | The Utmost Greatness | 1979-03-08 | |
| Movie | The Best Hustler Wins | Magistrate | 1979-01-18 |
| Movie | The Money Trip | Unknown | 1979-04-05 |
| Movie | The Dragon, The Odds | Unknown | 1979-07-27 |
| Movie | Heroes Two | Manchu Thug (uncredited) | 1974-01-19 |
| Movie | Men from the Monastery | Extra (uncredited) | 1974-04-03 |
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