2023 Istanbul Challenger

{{Infobox tennis event|2023|Istanbul Challenger|

| date=4–10 September

| edition=37th

| surface=Hard

| location=Istanbul, Turkey

| champs={{flagicon|BIH}} Damir Džumhur

| champd={{flagicon|GBR}} Luke Johnson / {{flagicon|TUN}} Skander Mansouri

}}

The 2023 Istanbul Challenger was a professional tennis tournament played on hard courts. It was the 37th edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Istanbul, Turkey between 4 and 10 September 2023.

Singles main-draw entrants

class="sortable wikitable"
width="70"\| Country ! width="175"\| Player ! Rank¹ ! Seed
{{flag\|KOR}} \|Kwon Soon-woo \|104 \|1
{{flag\|NED}} \|Jesper de Jong \|141 \|2
{{flag\|SVK}} \|Lukáš Klein \|155 \|3
{{flag\|CRO}} \|Dino Prižmić \|176 \|4
{{flag\|BEL}} \|Gauthier Onclin \|198 \|5
{{flag\|FRA}} \|Harold Mayot \|204 \|6
{{flag\|BIH}} \|Damir Džumhur \|211 \|7
{{flag\|SVK}} \|Norbert Gombos \|217 \|8

class="sortable wikitable"

width="70"| Country

! width="175"| Player

! Rank¹

! Seed

|104

|141

|155

|176

|198

|204

|211

|217

¹ Rankings are as of 28 August 2023.{{Cite web|url=https://www.atptour.com/en/rankings/singles|title=Rankings | Singles | ATP Tour | Tennis|website=ATP Tour}}

The following players received wildcards into the singles main draw:

The following players received entry from the qualifying draw:

{{flagicon|BIH}} Damir Džumhur def. {{flagicon|SVK}} Lukáš Klein 7–6^(7–5), 6–3.

{{flagicon|GBR}} Luke Johnson / {{flagicon|TUN}} Skander Mansouri def. {{flagicon|NED}} Sander Arends / {{flagicon|PAK}} Aisam-ul-Haq Qureshi 7–6^(7–3), 6–3.