A Guilty Conscience (traditional Chinese: 毒舌大狀; simplified Chinese: 毒舌大状; Jyutping: Duk⁶ sit³ daai⁶ zong⁶; pinyin: Dúshé dà zhuàng; lit. 'Poison-tongued Barrister') is a 2023 Hong Kong legal drama film co-written and directed by Jack Ng, in his directorial debut. The film follows the trial of a single mother (Louise Wong) wrongly charged with the murder of her daughter. An attorney (Dayo Wong) vows to clear her name. It stars an ensemble cast including Dayo Wong, Louise Wong and Tse Kwan-ho.

It was released on 21 January 2023, coinciding with Chinese New Year's Eve. A Guilty Conscience received acclaim for its screenwriting, direction and acting, particularly that of Dayo Wong, Louise Wong and Tse. The film grossed HK$114,293,675 (£11.6 M) and became the highest-grossing Chinese film in Hong Kong to date, surpassing the 2022 film Warriors of Future. The film was partly financed by the Hong Kong government's film development fund.

It received 10 nominations at 42nd Hong Kong Film Awards, and won Best Film.