Ruy Barretto SC takes on cases which require attention to technical or medical matters, trials involving much witness evidence and expert evidence, cross-examination and detailed case preparation. He has been involved in important cases on principle and practice such as:

Leung Tsang Hung v Lee Wai Yue and the Incorporated Owners of Kwok Wing House CACV 195/2004; [2007] 4 HKLRD 654; (2007) 10 HKCFAR 480
- a leading case on public nuisance, occupiers liability and the Building Management Ordinance

Poon Hau Kei v Hsin Chong Construction Co Ltd [2004] 2 HKLRD 442; (2004) 7 HKCFAR 148
- a case on pleading and principle for Personal Injury Litigation

Lo Siu Wa v Employees Compensation Assistance Fund Board [2018] HKCFA 3

Alan Deakins v Leung Kwong Wai Humphrey HCPI 617/2007

Yeung Lai Ping v Secretary for Justice HCPI 833/2002

Tsang Tik Man v Kan Ki Leung, Stephen [2002] 1 HKLRD 29
- a landmark case on traumatic stress and mental cruelty leading to personal injury

Kristan Philips v Initial Environmental Services Ltd and 4 others [HKCU] 594
- a leading judgment on pesticide injury, 31st July 1997, Seagroatt J