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• O.S. Perera v. Attorney General – SLR – 54, Vol 2 of 1987 [1987] LKCA 25; (1987) 2 Sri LR 54 (12 February 1987)
• Obeyesekera v. Edwardias Et Al. – NLR – 124 of 23 [1921] LKCA 11; (1921) 23 NLR 124 (1 September 1921)
• Obeyesekera v. Euwardias – NLR – 462 of 23 [1921] LKCA 68; (1921) 23 NLR 462 (1 September 1921)
• Obeyesekere v. Endories – NLR – 457 of 66 [1962] LKCA 38; (1962) 66 NLR 457 (30 August 1962)
• Obeyesekere v. Fonseka – NLR – 334 of 36 [1934] LKCA 16; (1934) 36 NLR 334 (22 March 1934)
• Obeysekera v. Chandra – SLR – 307, Vol 1 of 1993 [1992] LKCA 22; (1993) 1 Sri LR 307 (28 July 1992)
• Odiris Appuhamy v. Caroline Nona – NLR – 241 of 66 [1964] LKCA 15; (1964) 66 NLR 241 (8 July 1964)
• Odiris v. Andrayas – NLR – 110 of 72 [1969] LKCA 42; (1969) 72 NLR 110 (23 June 1969)
• Odirishamy v. Elaris – NLR – 68 of 46 [1944] LKCA 11; (1944) 46 NLR 68 (18 December 1944)
• Odris Et Al. v. Mendis Et Al. – NLR – 309 of 13 [1910] LKCA 57; (1910) 13 NLR 309 (30 June 1910)
• Ohlmus v. Ohlmus – NLR – 183 of 9 [1906] LKCA 63; (1906) 9 NLR 183 (10 March 1906)
• Okandeyaye Wangeesa Thera v. Mulgirigala Sunanda Thera – NLR – 388 of 65 [1962] LKCA 19; (1962) 65 NLR 388 (14 September 1962)
• Olagappa Chettiar v. Reith – NLR – 91 of 43 [1941] LKCA 2; (1941) 43 NLR 91 (28 March 1941)
• Olive Hughes v. Perera Et Al. – NLR – 169 of 54 [1952] LKCA 32; (1952) 54 NLR 169 (24 April 1952)
• Oliver v. The Ceylon Company – NLR – 182 of 3 [1874] LKCA 1; (1874) 3 NLR 182 (18 February 1874)
• Omer v. Caspersz – NLR – 494 of 65 [1963] LKCA 41; (1963) 65 NLR 494 (28 June 1963)
• Omer v. Fernando – NLR – 135 of 16 [1913] LKCA 55; (1913) 16 NLR 135 (6 February 1913)
• Opalgalla Tea and Rubber Estates, Ltd. v. Hussain – NLR – 254 of 45 [1944] LKCA 58; (1944) 45 NLR 254 (17 May 1944)
• Oretra Enterprises & Others v. Wijekoon – SLR – 1, Vol 3 of 2003 [2002] LKCA 1; (2003) 3 Sri LR 1 (22 November 2002)
• Orloff Et Al. v. Grebe Et Al. – NLR – 183 of 10 [1904] LKCA 33; (1904) 10 NLR 183 (13 October 1904)
• Orr v. Gunatilleke – NLR – 178 of 24 [1922] LKCA 126; (1922) 24 NLR 178 (20 January 1922)
• Orr v. Orr – NLR – 57 of 22 [1920] LKCA 58; (1920) 22 NLR 57 (9 June 1920)
• Othman v. Jinadasa – NLR – 149 of 29 [1927] LKCA 52; (1927) 29 NLR 149 (25 July 1927)
• Owen v. Ratnaike Et Al. – NLR – 333 of 3 [1899] LKCA 8; (1899) 3 NLR 333 (26 April 1899)
• Ower Silva v. Ranisaram – SLR – 223, Vol 3 of 2003 [2002] LKCA 81; (2003) 3 Sri LR 223 (27 August 2002)