| Delhi Open | |
| Type: | joint |
| Event Name: | Delhi Open (2015–present) ONGC-GAIL Delhi Open (2014) |
| Location: | New Delhi, India |
| Venue: | R.K. Khanna Tennis Complex |
| Surface: | Hard / Indoor |
| Atp Category: | ATP Challenger Tour |
| Atp Draw: | 32S / 32Q / 16D / 4Q |
| Atp Prize Money: | $50,000 |
| Wta Tier: | ITF Women's Circuit |
| Wta Draw: | 32S / 48Q / 16D |
| Wta Prize Money: | $25,000 |
The Delhi Open (formerly known as ONGC–GAIL Delhi Open) is a professional tennis tournament played on outdoor hard courts. It is currently part of the ATP Challenger Tour and the ITF Women's Circuit. Since 2014, it has been held annually at the R.K. Khanna Tennis Complex in New Delhi, India.
| Year | Champion | Runner-up | Score |
|---|---|---|---|
 Geoffrey Blancaneaux | 6–4, 6–2[1] | ||
| 2017–23 | Not held | ||
| Stéphane Robert | 6–3, 6–0 | ||
 Somdev Devvarman | 3–6, 6–4, 6–0 | ||
| Somdev Devvarman | 6–3, 6–1 | ||
| Year | Champions | Runner-up | Score | |
|---|---|---|---|---|
 Piotr Matuszewski Matthew Romios | Jakob Schnaitter Mark Wallner | 6–4, 6–4 | ||
| 2017–23 | Not held | |||
| Yuki Bhambri Mahesh Bhupathi | Saketh Myneni Sanam Singh | 6–3, 4–6, [10–5] | ||
 Egor Gerasimov Alexander Kudryavtsev |  Riccardo Ghedin Toshihide Matsui | 6–7(5–7), 6–4, [10–6] | ||
| Saketh Myneni Sanam Singh |  Sanchai Ratiwatana Sonchat Ratiwatana | 7–6(7–5), 6–4 |
| Year | Champion | Runner-up | Score |
|---|---|---|---|
 Sabina Sharipova | 3–6, 6–2, 6–4 | ||
| Magda Linette | 6–1, 6–1 | ||
 Wang Qiang | 6–1, 6–3 | ||
| Year | Champion | Runner-up | Score |
|---|---|---|---|
| Hsu Ching-wen Lee Ya-hsuan | Natela Dzalamidze Veronika Kudermetova | 6–0, 0–6, [10–6] | |
| Tang Haochen Yang Zhaoxuan | Hsu Ching-wen Lee Pei-chi | 7–5, 6–1 | |
| Nicha Lertpitaksinchai Peangtarn Plipuech | Erika Sema Yurika Sema | 7–6(7–5), 6–3 | |