Gregoria Mariska Tunjung Cahyaningsih (born 11 August 1999) is an Indonesian badminton player in women's singles.

[3] She started her career at the badminton club PB Mutiara Cardinal in Bandung, West Java, and was called to the national team in 2013.

[6] In 2014, Tunjung reached the final of the Malaysia International from qualifying round, beating among them the first seed Aprilia Yuswandari.

[7] In 2015, at the age of 16, Tunjung became champion at the Singapore International, defeating home favorite Yeo Jia Min in the final.

[10] Tunjung opened the 2017 season by reaching the final of the BWF Grand Prix in the Syed Modi International.

[13][14] In October, Tunjung becomes the first Indonesian in 25 years to win the World Junior Championship girls' singles title.

[31] Tunjung began showing visible progress with a quarter-finals finish at the All England Open in March, where she gave a tough fight to fourth seed and Olympic gold medalist Chen Yufei.

[33] Tunjung won her first ever BWF World Tour title at the Spain Masters by beating P. V. Sindhu in the final.

[34] After this achievement, Tunjung's world rank rose to 10th, making her the first Indonesian women's singles player to enter the top 10 since Maria Kristin Yulianti in 2008.

[35] In April, Tunjung advanced to the quarter-finals of the Asian Championships, but was eliminated by Chen Yufei in rubber games.

[47] [48] She bounced back at the Kumamoto Masters by defeating Chen Yufei in the finals, thus becoming the first ever Indonesian women's singles player to win a Super 500 or equivalent title since its inception in 2007.

[50] Nevertheless, she secured her spot in the World Tour Finals as part of group A with An Se-young, Tai Tzu-ying, and Kim Ga-eun.

[52] At the Paris 2024 Olympic Games, Spanish player Carolina Marin retired from her semi-final match against He Bingjiao from China due to a right knee injury.