Ennore, also spelt Eṇṇūr, is a neighbourhood in Chennai, India. Ennore is situated on a peninsula and is bounded by the Korttalaiyar River, Ennore Creek and the Bay of Bengal. The creek separates south Ennore from the north Ennore which covers major portions of North Chennai Thermal Power Station and Ennore Port. The neighbourhood is served by Ennore railway station. Over the years Ennore has become the hub of a range of industrial projects, mainly thermal power stations, fertilizer factories, industrial ports and coal yards.

The neighbourhood is part of the Avadi–Ambattur–Sembium–Tiruvottriyur–Ennore "auto belt" in the city's industrial north and west regions that developed when the automobile industry developed in Madras, in the early post-World War II years. Ennore was one of the "five 'new villages' " that were annexed with the then new British town of Madras in 1708.

Administratively Ennore is divided into South and North regions. The mostly residential south region is governed by Greater Chennai Corporation as ward 1 in zone 1. The south region is a part of Kathivakkam revenue village in Tiruvottiyur taluk of Chennai district. The completely industrialized north region is governed by Athipattu village panchayat in Minjur revenue block. The north region is administered by Ennore revenue village in Athipattu Town Panchayat of Ponneri taluk of Tiruvallur district. The north region is completely occupied by North Chennai Thermal Power Station and Ennore Port.

Ennore Creek is a backwater located in Tiruvallur district, Tamil Nadu. The Ennore Creek is bound on the north by the Pulicat Lake and to the south by the Manali marshlands. The Arani River enters the creek's northern edge below Lake Pulicat. To the south, Kosasthalaiyar River and the surplus course of the Puzhal Lake enter the creek. The estuary at Mugatwarakuppam drains all of these waters into the Bay of Bengal. Six revenue villages, namely Kathivakkam, Ennore, Puzhudhivakkam, Athipattu Pudunagar, Kattupalli and Kalanji are located around the Creek.

Ennore Creek, along with the Buckingham Canal and the rest of the Pulicat water system has vast importance for the environment and for the local fisher folk. Ennore Creek nurtures a healthy aquatic ecosystem which was once famous for its rich biodiversity. This creek is part of a lagoon ecosystem that plays a vital role in balancing the coastal ecosystem in the area. The ecologically sensitive ecosystem was home to large swamps of mangroves that not only ensured a sustainable regeneration of fish resources, but also help mitigate flooding in times of strong rainfall, high tides and cyclones. Kuppam and Sivanpadaiveethi Kuppam rely wholly and perennially on the river and creek.

For decades, this creek sustained the livelihoods of the residents in the surrounding villages and has been demarcated as CRZ I (ecologically sensitive area in the coastal zone management plan by the Tamil Nadu State Coastal Zone Management Authority). Undertaking any reclamation, bunding, construction or altering the natural courses of such water bodies is illegal under the CRZ Notification 2011, Water (Prevention and Control of Pollution) Act 1974 and the Environment Protection Act, 1986.

Despite being protected under such regulations, the unplanned industrial development of this area over the last few decades have had devastating effects on the whole ecosystem, resulting in loss of ecology and livelihoods of the fishing communities. The creek is encroached by industries in several locations, which led to a reduction of the water covered area. Already 1090 acres of the total 8000 acres of the Creek are encroached. Of the area that is still water covered the depth of the water is reduced by fly ash from the North Chennai Thermal Power Station. In some areas the ash has reduced the depth of the creek from 14 feet below sea level to 2 to 4 feet. This reduces the creek's ability to carry water, which is crucial, especially in times of flooding.

In December 2015, areas like Kuruvimedu, Athipattu, Athipattu Pudunagar, Ernavur, Manali New Town etc. were badly affected by floodwaters that did not recede as expected. The drastic reduction in the wetland area, and the depth of what remained has reduced the Creek's ability to evacuate floodwaters from Kosasthalaiyar, Puzhal surplus, Buckingham Canal and the Araniyar.