Ko A-sung (born 10 August 1992) is a South Korean actress. She began her career as a child actress, notably in 2006 top-grossing blockbuster The Host. This was followed by major roles in Snowpiercer (2013), Thread of Lies (2014) and Office (2015), as well as the TV dramas Master of Study (2010) and Heard It Through the Grapevine (2015).
| Series | I Am Also a Film Director | Unknown | 2027 |
| Movie | Nervous | Unknown | 2027 |
| Movie | The Host : Histoires de famille | Go A-sung | 2027 |
| Movie | Pavane | Mi-jung | 2026-02-19 |
| Movie | Time of Cinema | Unknown | 2026-03-18 |
| Series | Edward Lee's Country Cook | Self | 2025-02-14 |
| Series | 인생이 영화 | Unknown | 2025-04-12 |
| Movie | Because I Hate Korea | Joo Kye-na | 2024-08-28 |
| Movie | Honeysweet | Serenade Woman | 2023-08-15 |
| Series | The Seasons | Self | 2023-02-05 |
| Series | Doona! | Ha-yeon | 2023-10-20 |
| Series | Tracer | Seo Hey-young | 2022-01-07 |
| Series | Next Entertainment, Visionary | Self | 2021-01-18 |
| Series | Crime Puzzle | Yoo-hee | 2021-10-29 |
| Series | SNL Korea | Self | 2021-09-04 |
| Series | Show!terview with Jessi | Self | 2020-06-11 |
| Movie | Samjin Company English Class | Lee Ja-young | 2020-10-21 |
| Series | K-Ocean Pathfinders | Unknown | 2020-10-18 |
| Movie | A Resistance | Yu Gwan-sun | 2019-02-27 |
| Series | Amazing Saturday | Self | 2018-04-07 |
| Series | Life on Mars | Yoon Na-Young | 2018-06-09 |
| Movie | The King | Miss Kim | 2017-01-18 |
| Series | Radiant Office | Eun Ho-Won | 2017-03-15 |
| Series | Midnight Diner: Tokyo Stories | Yoona | 2016-10-21 |
| Movie | A Melody to Remember | Park Joo-mi | 2016-01-21 |
| Series | Heard It Through the Grapevine | Seo Bom | 2015-02-23 |
| Movie | The Beauty Inside | Woo-jin 101 | 2015-08-20 |
| Movie | Right Now, Wrong Then | Yeom Bora | 2015-09-24 |
| Movie | Office | Lee Mi-rye | 2015-09-03 |
| Movie | Thread of Lies | Lee Man-ji | 2014-03-13 |
| Movie | Snowpiercer International Special Animation | Yona (voice) | 2013-07-18 |
| Movie | Snowpiercer | Yona | 2013-08-01 |
| Movie | Duet | Nancy | 2012-04-19 |
| Series | Baeksang Arts Awards | Self | 2012-04-26 |
| Movie | 3.11 A Sense of Home Films | Unknown | 2011-09-11 |
| Series | Master of Study | Gil Pul-ip | 2010-01-04 |
| Series | Running Man | Unknown | 2010-07-11 |
| Series | You Hee-yeol's Sketchbook | Self | 2009-04-24 |
| Movie | A Brand New Life | Ye-shin | 2009-10-29 |
| Movie | After the Banquet | Mi-rae | 2009-12-03 |
| Movie | Radio Dayz | Sun-deok | 2008-01-31 |
| Movie | Happy Life | Gi-yeong's daughter, Joo-hee | 2007-09-12 |
| Movie | The Host | Park Hyun-seo | 2006-07-27 |
| Series | 울라불라 블루짱 | Noh Da-ji | 2004-03-02 |
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