| Date: | 11–17 May 2015 (ATP) 18–24 May 2015 (ITF) |
| Edition: | 1st (ATP) 2nd (ITF) |
| Category: | ATP Challenger Tour ITF Women's Circuit |
| Location: | Seoul, South Korea |
| Prize Money: | $50,000 |
| Champms: |  Go Soeda |
| Champmd: |  Gong Maoxin / Peng Hsien-yin |
| Champws: | Riko Sawayanagi |
| Champwd: | Chan Chin-wei / Lee Ya-hsuan |
| Before Name: | Seoul Open Women's Challenger |
The 2015 Lecoq Seoul Open was a professional tennis tournament played on outdoor hard courts. It was the second edition of the tournament for women and the first edition for men. It was part of the 2015 ATP Challenger Tour and the 2015 ITF Women's Circuit, offering a total of $50,000 in prize money. It took place in Seoul, South Korea, on 11–17 May 2015 for men and 18–24 May 2015 women.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Lu Yen-hsun | 64 | 1 | ||
| Japan | Go Soeda | 85 | 2 | |
 Korea, Republic of | Chung Hyeon | 88 | 3 | |
| Japan | Tatsuma Ito | 98 | 4 | |
 Slovakia | ||||
 Ukraine | Illya Marchenko | 129 | 6 | |
 Russian Federation | Alexander Kudryavtsev | 130 | 7 | |
| Jimmy Wang | 137 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
The following players received entry by lucky loser spots:
The following player received entry by a special exempt:
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Belgium | An-Sophie Mestach | 114 | 1 | |
| Japan | Nao Hibino | 189 | 2 | |
| Japan | Naomi Osaka | 191 | 3 | |
 Thailand | Varatchaya Wongteanchai | 207 | 4 | |
| Japan | Miharu Imanishi | 214 | 5 | |
| Indy de Vroome | 218 | 6 | ||
| Korea, Republic of | Jang Su-jeong | 227 | 7 | |
| Korea, Republic of | Han Na-lae | 247 | 8 |
The following players received wildcards into the singles main draw:
Ahn Yu-jin Hong Seung-yeon Kim Sun-jung Lee So-raThe following players received entry from the qualifying draw:
See main article: 2015 Lecoq Seoul Open – Men's singles.
Go Soeda def. Chung Hyeon, 3–6, 6–3, 6–3See main article: 2015 Lecoq Seoul Open – Women's singles.
Riko Sawayanagi def. Jang Su-jeong, 6–4, 6–4See main article: 2015 Lecoq Seoul Open – Men's doubles.
Gong Maoxin / Peng Hsien-yin def. Lee Hyung-taik / Danai Udomchoke, 6–4, 7–5See main article: 2015 Lecoq Seoul Open – Women's doubles.
Hong Seung-yeon / Kang Seo-kyung, 6–2, 6–1
