| Conflict: | Cossack raid on Istanbul (1620) |
| Partof: | the Cossack Naval Campaigns and the Ottoman–Polish War (1620–1621) |
| Date: | 1620 |
| Place: | Istanbul, Marmara Region, Ottoman Empire |
| Result: | Cossack victory |
| Combatant1: | Zaporozhian Cossacks |
| Combatant2: | Ottoman Empire |
| Commander1: | Yakiv Borodavka-Neroda |
| Commander2: | Mustafa I |
| Strength1: | Unknown |
| Strength2: | Unknown |
| Casualties2: | Unknown |
| Casualties1: | Unknown |
The Cossack raid on Istanbul (Ukrainian: Козацький рейд на Стамбул, Turkish: İstanbul'a Kazak baskını; 1620) was a raid on the capital of the Ottoman Empire Istanbul by the Zaporozhian Cossacks under the command of Yakiv Borodavka-Neroda as a part of the Cossack Naval Campaigns and the Ottoman–Polish War (1620–1621).
In 1620 relations between the Ottoman Empire and the Polish-Lithuanian Commonwealth were rapidly deteriorating due to frequent raids from Cossacks. The Ottomans stated that they would break their peace agreement and declare war against Poland if they did not stop the Cossack raids.
The Ottomans promised to abandon these plans if, within four months, the Commonwealth destroyed the Cossacks. Although the Polish ambassador in Istanbul agreed, negotiations soured as the Ottoman ambassador was treated with disrespect. Thus, the Ottomans decided to end the Cossack raids themselves and proceeded to build a string of fortresses in southern Ukraine as preparation. However, the Cossacks had already decided to attack Turkey. Having learned about this, the Polish ambassador immediately escaped from Istanbul. The result of the raid was a Cossack victory.
The Cossacks then raided Varna on the Bulgarian coast, which was under the control of the Ottomans. The city was completely looted.
The raid formed the pretext for the Battle of Cecora (1620).
1. М. Грушевський. Історія України-Руси. Том VII. Розділ VII. Стор. 7.
2. Cepandant les Cosaques aves les 150 barques ravagent toute la mer Noire — l. c. c. 412.
3. Les Cosaques sont á toute heure pros d'ici sur la mer Noire, ou ils font des prises incroiables veu leur faiblesse et sont en telle reputation, qu' il faut des coups de baston pour faire resoudre les soldats turcs à aller à la guerre contre eux sur quelques galères qne le Grand-Seigr y enovoie avec lagrande peine- Депеші д-Сезі с. 412.