List of 2020 box office number-one films in South Korea
# List of 2020 box office number-one films in South Korea

The following is a list of 2020 box office number-one films in South Korea. When the number-one film in gross is not the same as the number-one film in admissions, both are listed.

The box office dropped in February after the COVID-19 pandemic in South Korea. Some films were postponed.

| # | Date | Film | Gross |
| - | - | - | - |
| 1 | January 5, 2020 | Ashfall | US$4.1 million |
| 2 | January 12, 2020 | Dolittle | US$5.1 million |
| 3 | January 19, 2020 | Secret Zoo | US$4.1 million |
| 4 | January 26, 2020 | The Man Standing Next | US$15.1 million |
| 5 | February 2, 2020 | The Man Standing Next | US$3.7 million |
| 6 | February 9, 2020 | The Closet | US$3.6 million |
| 7 | February 16, 2020 | Honest Candidate | US$4.8 million |
| 8 | February 23, 2020 | Beasts Clawing at Straws | US$1.7 million |
| 9 | March 1, 2020 | The Invisible Man | US$0.8 million |
| 10 | March 8, 2020 | The Invisible Man | US$0.6 million |
| 11 | March 15, 2020 | The Invisible Man | US$0.4 million |
| 12 | March 22, 2020 | The Invisible Man | US$0.3 million |
| 13 | March 29, 2020 | Judy | US$0.2 million |
| 14 | April 5, 2020 | Ip Man 4: The Finale | US$0.1 million |
| 15 | April 12, 2020 | 1917 | US$0.1 million |
| 16 | April 19, 2020 | La La Land | US$0.1 million |
| 17 | April 26, 2020 | La La Land | US$0.1 million |
| 18 | May 3, 2020 | Trolls World Tour | US$0.2 million |
| 19 | May 10, 2020 | A Rainy Day in New York | US$0.3 million |
| 20 | May 17, 2020 | Escape from Pretoria | US$0.2 million |
| 21 | May 24, 2020 | The Greatest Showman | US$0.2 million |
| 22 | May 31, 2020 | Underwater | US$0.3 million |
| 23 | June 7, 2020 | Intruder | US$1.9 million |
| 24 | June 14, 2020 | Innocence | US$1.9 million |
| 25 | June 21, 2020 | Innocence | US$1.1 million |
| 26 | June 28, 2020 | #Alive | US$5.3 million |
| 27 | July 5, 2020 | #Alive | US$1.9 million |
| 28 | July 12, 2020 | #Alive | US$1.0 million |
| 29 | July 19, 2020 | Peninsula | US$9.2 million |
| 30 | July 26, 2020 | Peninsula | US$4.5 million |
| 31 | August 2, 2020 | Steel Rain 2: Summit | US$5.0 million |
| 32 | August 9, 2020 | Deliver Us from Evil | US$10.6 million |
| 33 | August 16, 2020 | Deliver Us from Evil | US$7.1 million |
| 34 | August 23, 2020 | Deliver Us from Evil | US$1.5 million |
| 35 | August 30, 2020 | Tenet | US$3.0 million |
| 36 | September 6, 2020 | Tenet | US$1.9 million |
| 37 | September 13, 2020 | Tenet | US$1.4 million |
| 38 | September 20, 2020 | Tenet | US$1.0 million |
| 39 | September 27, 2020 | Tenet | US$0.8 million |
| 40 | October 4, 2020 | Pawn | US$4.0 million |
| 41 | October 11, 2020 | Pawn | US$2.1 million |
| 42 | October 18, 2020 | Voice of Silence | US$1.5 million |
| 43 | October 25, 2020 | Samjin Company English Class | US$2.2 million |
| 44 | November 1, 2020 | Samjin Company English Class | US$3.4 million |
| 45 | November 8, 2020 | Collectors | US$3.7 million |
| 46 | November 15, 2020 | Collectors | US$2.3 million |
| 47 | November 22, 2020 | Collectors | US$1.3 million |
| 48 | November 29, 2020 | Best Friend | US$1.0 million |
| 49 | December 6, 2020 | Best Friend | US$0.5 million |
| 50 | December 13, 2020 | Josée | US$0.5 million |
| 51 | December 20, 2020 | Josée | US$0.3 million |
| 52 | December 27, 2020 | Wonder Woman 1984 | US$1.8 million |
