Sweet Girl is the sixth "mini-album" EP released by South Korean boy group B1A4 under WM Entertainment. The album was released on August 10, 2015 by WM Entertainment and distributed by LOEN Entertainment.^{[lower-alpha 1]} The title song of the album, "Sweet Girl", along with the other songs, was produced by leader Jinyoung. CNU also produced one song in the album called "Love is Magic".^{[1][unreliable source?]} B1A4 won a trophy with "Sweet Girl" on the August 19 episode of MBC Every1 Show Champion^{[2][unreliable source?]} and earned the title of the tenth most watched Korean music video in America for August by Billboard.^[3]

B1A4 posted five red-tinted images on Facebook and Twitter of the individual members showing off a new mature B1A4. On July 31, 2015, B1A4 posted a teaser video of all five songs on the album and a music video teaser on August 4, 2015. On August 6, they held a Guerilla Concert which was broadcast live via Naver's V app where they debuted three songs from their new album including "Sweet Girl".^{[4][unreliable source?]} The official music video for "Sweet Girl" was released August 10, 2015 alongside their album.^[5]