List of Gaon Digital Chart number ones of 2017
The Gaon Digital Chart is a chart that ranks the best-performing singles in South Korea. Managed by the domestic Ministry of Culture, Sports and Tourism, its data is compiled by the Korea Music Content Industry Association and published by the Gaon Music Chart. The ranking is based collectively on each single's download sales, stream count, and background music use. In mid-2008, the Recording Industry Association of Korea ceased publishing music sales data. The MCST established a process to collect music sales in 2009, and began publishing its data with the introduction of the Gaon Music Chart the following February. With the creation of the Gaon Digital Chart, digital data for individual songs was provided in the country for the first time. Gaon provides weekly, monthly and yearly charts. Below is a list of singles that topped the weekly and monthly charts.
Weekly charts
| Week ending date | Song | Artist | |
| "Your Night" | Hwang Kwanghee X Gaeko featuring Oh Hyuk | ||
| "I Will Go to You like the First Snow" | Ailee | ||
| "I Will Go to You like the First Snow" | Ailee | ||
| "I Will Go to You like the First Snow" | Ailee | ||
| "The Song" | Zion.T | ||
| "Yesterday" | Block B | ||
| "Spring Day" | BTS | ||
| "Knock Knock" | Twice | ||
| "Fine" | Taeyeon | ||
| "Fine" | Taeyeon | ||
| "Anymore" | Jung Key featuring Wheein | ||
| "Plz Don't Be Sad" | Highlight | ||
| "Through the Night" | IU | ||
| "Really Really" | Winner | ||
| "Can't Love You Anymore" | IU with Oh Hyuk | ||
| "Palette" | IU featuring G-Dragon | ||
| "Palette" | IU featuring G-Dragon | ||
| "Be Well" | Sechs Kies | ||
| "I Luv It" | Psy | ||
| "Signal" | Twice | ||
| "Signal" | Twice | ||
| "Lonely" | Sistar | ||
| "Untitled, 2014" | G-Dragon | ||
| "We Loved" | Bolbbalgan4 and 20 Years of Age | ||
| "We Loved" | Bolbbalgan4 and 20 Years of Age | ||
| "Don't Know You" | Heize | ||
| "You, Clouds, Rain" | Heize featuring :ko:신용재|Shin Yong-jae | ||
| "Red Flavor" | Red Velvet | ||
| "Ko Ko Bop" | Exo | ||
| "Ko Ko Bop" | Exo | ||
| "Ko Ko Bop" | Exo | ||
| "Energetic" | Wanna One | ||
| "Ko Ko Bop" | Exo | ||
| August 26 | "Like It" | Yoon Jong-shin | |
| September 2 | "Gashina" | Sunmi | |
| September 9 | "We Are" | Woo Won-jae featuring Loco and Gray | |
| September 16 | "We Are" | Woo Won-jae featuring Loco and Gray | |
| September 23 | "Autumn Morning" | IU | |
| September 30 | "Something Special" | Sechs Kies | |
| October 7 | "Some" | Bolbbalgan4 | |
| October 14 | "Where You At" | NU'EST W | |
| October 21 | "Something Special" | Sechs Kies | |
| October 28 | "Love Story" | Epik High featuring IU | |
| November 4 | "Likey" | Twice | |
| November 11 | "When We Were Two" | Urban Zakapa | |
| November 18 | "Beautiful" | Wanna One | |
| November 25 | "Yes" | Yoon Jong-shin and Minseo | |
| December 2 | "Emptiness in Memory" | Naul | |
| December 9 | "Snow" | Zion.T featuring Lee Moon-se | |
| December 16 | "Heart Shaker" | Twice | |
| December 23 | "Lonely" | Jonghyun featuring Taeyeon | |
| December 30 | "Instagram" | Dean |