Hong Da-jung (born 3 February 1986) is a South Korean former professional tennis player.

[1] Born in Seoul, Hong was considered a tennis prodigy in South Korea and won the All Korea Junior Championships as a 14-year old.

She received training in the United States and reached a best ITF junior world ranking of 26.

[2][3] Hong, who is short in stature, played for the South Korea Fed Cup team in 2003, winning all three of her singles rubbers.