| Wkt |
| 3 | 221 | WU Tharanga (104) & CK Kapugedera (131) | Sri Lanka Under-19s v Pakistan Under-19s | National Stadium, Karachi | 2004/05 |
| 1 | 218 | PAD Lakshan (98) & HRB Boyagoda (116) | Sri Lanka Under-19s v West Indies Under-19s | Bert Sutcliffe Oval, Lincoln | 2017/18 |
| 1 | 191 | BHVC Peiris (103) & WIA Fernando (108) | Sri Lanka Under-19s v Zimbabwe Under-19s | Boland Park, Paarl | 2016/17 |
| 3 | 177 | MDKJ Perera (86) & SMA Priyanjan (92) | Sri Lanka Under-19s v England Under-19s | Kinrara Academy Oval, Kuala Lumpur | 2006/07 |
| 1 | 174 | DDM Rajakaruna (94) & MDUS Jayasundera (77) | Sri Lanka Under-19s v West Indies Under-19s | Village Green, Christchurch | 2009/10 |
| 3 | 168 | PBB Rajapaksa (154*) & MLR Buddika (57) | Sri Lanka Under-19s v Australia Under-19s | Gardens Oval, Darwin | 2009/10 |
| 4 | 157* | PAD Lakshan (101*) & PHKD Mendis (74*) | Sri Lanka Under-19s v Ireland Under-19s | Cobham Oval (New), Whangarei | 2017/18 |
| 2 | 154 | C Wickramasinghe (102) & SDL Daniel (59) | Sri Lanka Under-19s v Bangladesh Under-19s | Rangiri Dambulla International Stadium, Dambulla | 2021/22 |
| 1 | 149 | DM Jayalath (67) & WIA Fernando (138) | Sri Lanka Under-19s v England Under-19s | Spitfire Ground, St Lawrence, Canterbury | 2016 |
| 2 | 147 | WU Tharanga (117) & NMNP Nawela (56) | Sri Lanka Under-19s v South Africa Under-19s | Fatullah Khan Saheb Osmani Stadium, Fatullah | 2003/04 |
| 2 | 147 | WMK Bandara (86) & AA Inham (83*) | Sri Lanka Under-19s v Australia Under-19s | Sinhalese Sports Club Ground, Colombo | 2014/15 |
| 2 | 147 | HRB Boyagoda (191) & KNM Fernando (60) | Sri Lanka Under-19s v Kenya Under-19s | Lincoln No 3, Lincoln | 2017/18 |
| 5 | 143 | KNM Fernando (109*) & MNK Fernando (68) | Sri Lanka Under-19s v Zimbabwe Under-19s | Bert Sutcliffe Oval, Lincoln | 2017/18 |
| 3 | 142 | RP Hewage (83) & LPC Silva (85) | Sri Lanka Under-19s v South Africa Under-19s | Kingsmead, Durban | 1997/98 |
| 5 | 142 | LPC Silva (63) & MK Gajanayake (87) | Sri Lanka Under-19s v India Under-19s | Feroz Shah Kotla, Delhi | 1998/99 |
| 4 | 140 | AJADDLA Jayasinghe (102*) & DS Weerakkody (78) | Sri Lanka Under-19s v Australia Under-19s | Dr YS Rajasekhara Reddy ACA-VDCA Cricket Stadium, Visakhapatnam | 2011/12 |
| 6 | 139 | PBB Rajapaksa (130) & L Abeyratne (46) | Sri Lanka Under-19s v England Under-19s | Colts Cricket Club Ground, Colombo | 2010/11 |
| 5 | 137 | [unknown] & [unknown] | Sri Lanka Under-19s v Pakistan Under-19s | National Bank of Pakistan Sports Complex, Karachi | 2023/24 |
| 2 | 136 | [unknown] & [unknown] | Sri Lanka Under-19s v Pakistan Under-19s | National Bank of Pakistan Sports Complex, Karachi | 2023/24 |
| 3 | 134 | RN de Silva (65) & SB Waduge (56) | Sri Lanka Under-19s v West Indies Under-19s | Rangiri Dambulla International Stadium, Dambulla | 2023 |
| 3 | 132 | LD Chandimal (112*) & MDKJ Perera (55) | Sri Lanka Under-19s v England Under-19s | Sinhalese Sports Club Ground, Colombo | 2007/08 |
| 3 | 132 | WRR de Silva (85) & RVPK Mishara (87) | Sri Lanka Under-19s v Pakistan Under-19s | Mahinda Rajapaksha International Cricket Stadium, Hambantota | 2019 |
| 5 | 130 | DN Wellalage (113) & RM Somarathne (57*) | Sri Lanka Under-19s v South Africa Under-19s | Sir Vivian Richards Stadium, North Sound | 2021/22 |
| 7 | 127* | HKC Jayananda (78*) & K Gamage (60*) | Sri Lanka Under-19s v Bangladesh Under-19s | Colombo Cricket Club Ground, Colombo | 2024/25 |
| 1 | 126 | ND Paranavithana (45) & RVPK Mishara (123) | Sri Lanka Under-19s v Australia Under-19s | P Sara Oval, Colombo | 2018/19 |
| 3 | 125 | HS Amarasinghe (71) & RM Somarathne (81) | Sri Lanka Under-19s v England Under-19s | County Ground, New Road, Worcester | 2022 |
| 2 | 124 | WWWL Lakshan (71) & KIC Asalanka (63) | Sri Lanka Under-19s v Bangladesh Under-19s | Colts Cricket Club Ground, Colombo | 2014/15 |
| 1 | 124 | ND Paranavithana (108) & RVPK Mishara (69) | Sri Lanka Under-19s v England Under-19s | Coolidge Cricket Ground, Coolidge | 2019/20 |
| 5 | 123 | MLR Buddika (139) & MAP Fernando (51) | Sri Lanka Under-19s v South Africa Under-19s | Bidvest Wanderers Stadium, Johannesburg | 2009/10 |
| 1 | 122 | ND Paranavithana (54) & RVPK Mishara (65) | Sri Lanka Under-19s v Pakistan Under-19s | Mahinda Rajapaksha International Cricket Stadium, Hambantota | 2019 |
