| City Center | |
| Native Name: | Miðborg |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Iceland |
| Subdivision Type1: | Municipality |
| Subdivision Name1: | Reykjavík |
| Unit Pref: | Metric |
| Area Total Km2: | 3.6 |
| Population Total: | 8,600 |
| Population As Of: | 2010 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | IS-101 |
Reykjavík City Center (Icelandic: Miðborg in Icelandic pronounced as /ˈmɪðˌpɔrk/, Miðbær in Icelandic pronounced as /ˈmɪðˌpaiːr̥/, and sometimes Austurbær in Icelandic pronounced as /ˈœystʏrˌpaiːr̥/) is a sub-municipal administrational district that covers much of the central part Reykjavík, the capital of Iceland. The district includes six neighbourhoods: Kvos in Icelandic pronounced as /ˈkʰvɔːs/, Grjótaþorp in Icelandic pronounced as /ˈkrjouːtaˌθɔr̥p/, Skólavörðuholt in Icelandic pronounced as /ˈskouːlaˌvœrðʏˌhɔl̥t/, Þingholt in Icelandic pronounced as /ˈθiŋkˌhɔl̥t/, Skuggahverfi in Icelandic pronounced as /ˈskʏkːaˌkʰvɛrvɪ/ and Vatnsmýri in Icelandic pronounced as /ˈvasːˌmiːrɪ/.
It is the administrative center of Iceland, containing Alþingishúsið (the national parliament buildings), Stjórnarráðshúsið in Icelandic pronounced as /ˈstjou(r)tnarˌrauðsˌhuːsɪθ/ (the cabinet house) and the Supreme Court of Iceland. In addition, the area is home to many of the city's landmarks, including the Tjörnin pond, the town hall, and Hallgrímskirkja, the largest church in Iceland; tourist flow is considerable. The city center is also the center of Reykjavík's nightlife; many of the city's bars and nightclubs are located in Austurstræti (East Street) and Bankastræti (Bank Street).