| Date: | 9–15 May |
| Edition: | 2nd |
| Location: | Seoul, South Korea |
| Prize Money: | $100,000 |
| Champs: |  Sergiy Stakhovsky |
| Champd: |  Matt Reid / John-Patrick Smith |
| After Name: | Seoul Open Challenger |
The 2016 Lecoq Seoul Open was a professional tennis tournament played on outdoor hard courts. It was the second edition of the tournament. It was part of the 2016 ATP Challenger Tour, offering a total of $100,000 in prize money. It took place in Seoul, South Korea, on 9–15 May 2016.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Australia | John Millman | 67 | 1 | |
 Korea, Republic of | ||||
| Australia | Sam Groth | 95 | 3 | |
 United Kingdom | Daniel Evans | 97 | 4 | |
| Lu Yen-hsun | 102 | 5 | ||
 Japan | Tatsuma Ito | 106 | 6 | |
| Japan | Yūichi Sugita | 111 | 7 | |
 Slovakia | Lukáš Lacko | 112 | 8 |
The following players received wildcards into the singles main draw:
Hong Seong-chan Kang Ho-gi Kwon Soon-woo Nam Ji-sungThe following players received entry from the qualifying draw:
Liam Broady Yuya Kibi Alexander WardThe following player entered as a lucky loser:
Shuichi SekiguchiSee main article: 2016 Lecoq Seoul Open – Singles.
Sergiy Stakhovsky def. Lu Yen-hsun, 4–6, 6–3, 7–6(9–7)See main article: 2016 Lecoq Seoul Open – Doubles.
Matt Reid / John-Patrick Smith def. 
Gong Maoxin / Yi Chu-huan, 6–3, 7–5