Yu Mengyu (Chinese: 于梦雨; pinyin: Yú Mèngyǔ; born 18 August 1989) is a retired Singaporean table tennis player.

[9] She defeated Kasumi Ishikawa and Liu Shiwen consecutively in the women's team event at the 2012 Asian Table Tennis Championships, thereby helping Singapore secure the runner-up position.

In 2021, Prime Minister Lee Hsien Loong of Singapore praised Yu at the National Day Rally, commending her spirit of “to be indomitable, to keep going and never give up” during the Tokyo Olympic Games.

[16] With the opportunity to compete in international competitions, Yu accepted the invitation and joined the STTA under the Foreign Sports Talent Scheme.

[17] In March 2023, Yu left the table tennis scene for the time being to pursue a degree of Executive Master of Public Administration (EMPA) at Nanyang Technological University (NTU, world ranking 12th in the QS ranking in year 2022), after becoming the first Singapore athlete to receive a full scholarship from the Nanyang Centre for Public Administration (NCPA).

The team defeated China, 17-time winner and the reigning world champion, with a score of 3–1, which was one of the greatest upsets in table tennis history.

[5] In February–March 2011, during the 20th Asian Table Tennis Championships held in Macau, the Singapore women's team, consisting of Yu, Feng, Wang, Li, and Sun, won the semifinal against the Japanese team that composed of Ai Fukuhara, Kasumi Ishikawa, and Sayaka Hirano, with a score of 3-2, thereby securing their place in the final.

Notably, in the third game of the final, Yu earnt Singapore's sole point in the match by staging a comeback to win 3-2 (7-11, 6-11, 11-8, 11-5, 11-8) against Chinese player Liu Shiwen.

[23] Yu and her partner Feng Tianwei represented Singapore to participate in the 2012 International Table Tennis Federation (ITTF) World Tour Grand Finals.

Ultimately, they reversed the situation with a remarkable 4-3 win (11-13, 11-13, 11-8, 11-4, 11-3, 5-11, 11-2), thereby clinching the gold medal in the women's doubles event at the 2012 ITTF World Tour Grand Finals.

The Singaporean duo went through the competition with impressive performances, including defeating the Japanese pair of Kasumi Ishikawa and Mima Ito with a score of 4-1 (11-7, 11-5, 11-7, 8-11, 11-7) and securing a 4-0 victory (11-7, 11-6, 11-3, 11-8) against Japan’s Ai Fukuhara and Sayaka Hirano.

In the semi-final, they faced the top-ranked Chinese pair (World No.1) of Guo Yue and Li Xiaoxia, who eventually won the gold medal.

Eventually, they secured the bronze medal in the women's doubles event at the 2013 World Table Tennis Championships, which marked a commendable achievement for the Singaporean pair.

[25] Yu, together with her teammates Feng, Li, and Yee, participated in the 2014 World Table Tennis Team Championships held in Tokyo, Japan.

She defeated players such as Ni Xialian from Luxembourg, Li Jiao from the Netherlands, Suh Hyowon from South Korea, and Elizabeta Samara from Romania.

In the women's singles competition, she defeated German veteran Han Ying with a score of 4-2 and then secured a 4-1 victory against Japanese player Sayaka Hirano.

Despite winning the first set, Yu and Feng ended up with a 2-4 defeat (11-5, 8-11, 6-11, 4-11, 11-9, 8-11), obtaining a bronze medal in the women's doubles event at the 2014 ITTF World Tour Grand Finals.

In the semi-final, they faced the world's top-ranked Chinese pair Liu Shiwen and Zhu Yuling who were the eventual gold medallists.

Starting from April 2016, with the help of painkillers, steroid injections, and platelet-rich plasma therapy, Yu persevered through the 2016 Asian Cup and the Rio Olympics.

Still in the process of recovering from injuries, Yu represented Singapore in the 2017 World Table Tennis Championships held in Dusseldorf, Germany.

[42] In March 2021, during the WTT Star Contender event in Doha, Qatar, Yu's back injury flared up and had to return to Singapore in a wheelchair, putting her fitness in doubt for the 2020 Summer Olympics.

[10] In the singles competition of the Tokyo Olympics, Yu defeated fourth seed Cheng I-ching of Chinese Taipei with a score of 4-0.

[44] Subsequently, in the quarter-finals, despite losing the first game, Yu staged a comeback and won against Japanese player and fifth seed Kasumi Ishikawa with a score of 4-1, adjusting their head-to-head record to 8:8.

From 2019 to 2021, Yu was a player in Nissay Red Elf table tennis club in T.League, Japan, who won the T-League championship for three consecutive years from 2019 to 2021.

[51][52] Yu announced her retirement from the national team on 22 March 2022 at the Singapore Table Tennis Association's Annual Awards Night.

[53] After her retirement, Yu was appointed as an assistant coach for the Singapore Table Tennis Association's junior development squad for high-profile players aged 9 to 12.

[53] At the 2021 National Day Rally, Prime Minister Lee Hsien Loong said that Yu was the embodiment of the Singapore spirit after her Tokyo 2020 heroics in which she beat two top-10 opponents.

[54] Singapore National Olympic Council president Tan Chuan-Jin hailed Yu's outing at the Tokyo Games as a "glorious one" and praised her tenacity.