| Korea Open Women | 08/29 06:20 | 4 | Sin Yan Happy Lo v Hsiang Ti Lin | L | 0-2 | |
| Korea Open Women | 08/28 03:15 | 5 | Akane Yamaguchi v Sin Yan Happy Lo | W | 0-2 | |
| Japan Open Women | 08/21 00:00 | 5 | Sin Yan Happy Lo v Beiwen Zhang | L | 0-2 | |
| Olympics 2024 - Women | 07/30 18:20 | - | Supanida Katethong v Sin Yan Happy Lo | L | 2-0 | |
| Olympics 2024 - Women | 07/29 12:50 | - | Sin Yan Happy Lo v Juliana V. Viera | L | 0-2 | |
| Uber Cup | 05/01 01:30 | - | Sin Yan Happy Lo v Fadilah Shamika Mohamed Rafi | W | 2-0 | |
| Asia Championships Women | 04/10 06:30 | 5 | Tzu Ying Tai v Sin Yan Happy Lo | L | 2-0 | |
| Polish Open Women | 03/22 10:40 | - | Sin Yan Happy Lo v Anupama Upadhyaya | - | Walkover | |
| Orleans Masters Women | 03/14 12:45 | 4 | Sin Yan Happy Lo v Iris Wang | L | 0-2 | |
| Orleans Masters Women | 03/13 12:20 | 5 | Yu-Hsun Huang v Sin Yan Happy Lo | W | 1-2 | |
| German Open Women | 02/28 14:25 | 5 | Shuo Yun Sung v Sin Yan Happy Lo | L | 2-1 | |
| German Open Women Qual | 02/27 09:45 | 3 | Sin Yan Happy Lo v Haramara Gaitan | W | 2-0 |
Happy Lo Sin Yan (Chinese: 盧善恩; Jyutping: lou4 sin6 jan1; born 25 February 2003) is a badminton player from Hong Kong. She competed at the 2024 Paris Olympics.
She was a member of the Hong Kong team that participated at the 2022 Asian Games, where she lost her opening match to Japanese world number 10 and defending champion, Aya Ohori. In the team event, she lost to Taiwanese player Tai Tzu-ying as part of a 3–0 defeat for Hong Kong.
In December 2023, she defeated top seed Hsu Wen-chi on her way to the final at the 2023 Odisha Masters. She competed for Hong Kong that reached the quarter-finals at the 2024 Badminton Asia Team Championships in Malaysia.
She competed in the women's singles at the 2024 Paris Olympics.