| Gaj | |
| Other Name: | German: Herdain |
| Settlement Type: | District of Wrocław |
| Subdivision Type: | Country |
| Subdivision Name: |  Poland |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Lower Silesian |
| Subdivision Type2: | County/City |
| Subdivision Name2: | Wrocław |
| Established Date: | 1904 |
| Established Date1: | 1991 |
| Established Title: | Incorporated into the city |
| Established Title1: | Established the modern-day district |
| Parts Type: | Notable landmarks |
| Parts Style: | para |
| Population Total: | 19136 |
| Population As Of: | 2022 |
| Population Density Km2: | auto |
| Population Note: | [1] |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Area Code: | +48 71 |
Gaj (pronounced as /pl/,, pronounced as /de/) is a district in Wrocław located in the southern part of the city. It was established in the territory of the former Krzyki district.
Initially a village, the settlement was incorporated into Breslau (today's Wrocław) in 1904.[2]
The earliest record of the settlement of Gayn dates back to 1273.[3] The village was also mentioned by the name of Herdain, thought to derive from the name Herdan, whose son, Henryk, acquired 5.5 acres of land in the area of the village.[4]
In 1895 a small part of Herdain was incorporated into the borders of Breslau. The border of the then annexed part of the village ran along present-day Działkowa Street. In 1905, Breslau councilors decided to fully incorporate the village to the city.
In 1991, after reforms in the administrative division of Wrocław, Gaj became one of the city's 48 districts.[5]