Oberbürgermeister(in) / Mayor,  is the chairwoman of the city council and head of the city administration.

He (or she) chairs the decision-making bodies, i.e. the City Council and its decision-making committees. He heads the city administration and is responsible for the internal organization and ongoing administrative business.
The mayor carries out the decisions of the city council and its committees.

Obere Neustadt (Upper New Town)

Name for a current new development area above the Alaunpark in the border area between Äußere Neustadt and Albertstadt. According to the provider, “high-quality townhouses, stacked houses, townhouses” will be built, in other words, condominiums in multi-story residential buildings, and private homes primarily in terraced or group houses. The complex includes a shopping area on the ground floor, which includes, among other things, a large organic food market.

The project will be expanded to include a third construction phase in the next few years. Together with the already completed residential development and children's facilities around the Garrison Church as well as court and administrative buildings, mainly from the post-reunification period, an entire district close to the city center is being created here. A special advantage is the quiet apartment very close to the trendy district Äußere Neustadt.

The area is being designed by the Klettarchitekten office.

Oberer Hecht,  is the name given to the newer part of the Hechtviertel built in the 1920s. It essentially consists of a settlement built between 1924 and 1929 according to plans by Otto Schubert by the Small Housing and Homestead Association, now part of the Saxon Housing Cooperative. From the hechtstrasse, which runs south of the St.Pauli-Friedhof and a park, Bärwalder Strasse leads into the residential area into it. These two axes and Niederauer Platz are delimited by closed construction with typical 2 to 4-room apartments. Emphasized staircases, segmented arched loggias, bay windows and gate passages convey a dignified atmosphere. The park-like residential courtyard between Hecht- and Niederauer may be the largest in the city.
Obergohlis (district),  see special page Ortschaft Cossebaude
Oberlandesgericht,  today's OLG see Ständehaus
Oberloschwitz (district),  see special page Loschwitz
Oberpoyritz (district),  see special page Oberpoyritz
Oberwartha (district),  see special page Ortschaft Oberwarth
ODC, Otto-Dix-Centershopping-centre in Strehlen, on the border to Reick: large grocery market and electronic dealer, furnitures and smaller shops.

The ODC has a very high vacancy rate and is currently not very attractive. There is apparently a lack of buyers from the residential area on Reicker Strasse that was demolished a few years ago.

Offizierskasino,  The officers' mess of the former Royal Saxon Infantry Regiment No. 177 was located on Marienallee on a small hill on the grounds of the Saxon Cadet Institute. It was built in 1903 in the representative villa style of the turn of the century. Since 1956 it served as an officers' mess for the NVA troops. The casino was used primarily by staff officers of the 7th Armored Division. It was extensively renovated in the 1990s and today belongs to the grounds of the Army Officer School of the Bundeswehr.
Offizierschule des Heeres (OSH) / Officer school of the army,  the army school in the Albertstadt was opened in 1998 after a three years construction period and is the central training centre for the officers of the army. Three of the former plants of the more than 100 years old Barracks town were included into the army school in an architecturally successfull way: the institute for cadets, the Friedrich August barracks as well as the garrison military hospital. Until the fall of the Wall, the command staff of the NVA's 7th Panzer Division was stationed in part of the building.
Omsewitz (district),  see special page Omsewitz
Omsewitzer Grund,  kleines uriges Tal mit Lehrpfad im Dresdner Westen, überwiegend Streuobstwiesen und Viehweiden. Nahe des oberen Endes befindet sich das Ausflugslokal und Kulturzentrum Kümmelschänke, unteres Ende des Lehrpfades ist am Dorfkern Altleutewitz im Stadtteil Leutewitz.
Operetta,  see Staatsoperette
Orangerie,  two buildings were known under this name:

1. the former Orangerie "An der Herzogin Garten" (), built in 1841 by Otto von Wolframsdorf, was only partially recognisable as a ruin (street frontage to Ostra-Allee) from its destruction in the Second World War until recently. It was rebuilt in 2016/19 as a residential building, largely true to the original exterior, but a desired use for art and/or gastronomy could not be realised for economic reasons. ()

The newly renovated orangery garden is open to the public during the day.

2. Orangerie in the castles's park Pillnitz. ().

Orgelbaufirma Jehmlich ,  see Jehmlich Orgelbau
Orgelbaufirma Julius Jahn & Sohn,  Dresden organ building company that was run as a family business on Josephinenstrasse for three generations. The best-known and last master was Johannes Jahn, who took over the company from his father
Julius Jahn took over in 1910 and has been operating since then under the “organ building company Julius Jahn & Sohn”. company name.

The best-known works in Dresden are the Jahn organ in the Versoehnungskirche, which was largely renovated in its original form until 2009, and the now heavily modified organ in the Annenkirche.

Orpheum,  Built in 1873 as a classical ballroom, the Orpheum hosted the joy of beauty and grace of dance among upper society in the Elbe metropolis for almost 60 years. From 1932 to 1996 the piano manufacturing factory “Thierbach Pianos” was located here. The neoclassical event hall was lovingly reconstructed from 1996 to 1998.
Ortsämter,  since 2018, the local offices have again been referred to as city district offices and the local office areas as city districts.

see special page Stadtbezirke and Ortschaften

Ortschaften,  see special page Stadtbezirke and Ortschaften
Ortskrankenkasse ("Local health insurance company"),  the AOK's current administrative building was built in 1912/13 at Sternplatz as a reinforced concrete structure. It is an example of the monumental style within reform building architecture. The sculptural jewelry is remarkable. Two large figures made of tuff stone flank the main portal on both sides: a breastfeeding mother and a worker, between both doors there is a larger than life-sized atlas figure. All three figures come from Selmar Werner, while the figures on the fourth floor are from Georg Türke: worker, carpenter, baker, bricklayer, locksmith, blacksmith, stonemason and carpenter.

The area could not be developed in its entirety at the time, as residential houses had already stood on Josephinenstrasse since 1650. It was not until 1996 to 1998 that a modern new building was added to replace these houses that were destroyed in 1945.

Ortsteile (districts),  see Stadtteile (city districts)
Ortsteilzentrum1. colloquially the centre of a town or district

2. Official category from the Center concept of the state capital regarding the concentration of trade, services, cultural and social institutions. The 11 district centers (OTZ) follow the City center in the hierarchy and are supported by 24 centers close to home (Wohnnahe Zentren, WZ) followed.

Oschatzer Straße,  forms with the street Bürgerstraße the eastern shopping mall in the district Pieschen. After the war had a great importance with two department stores and several smaller specialist shops. After the change, despite reconstruction and raod works lost out on the Elbepark, a large Shopping Centre.

Until the fall of the Berlin Wall there were two well-known GDR textile department stores on the corner of Konkordienstrasse: Kontex (Konsum) and Magnet (HO, pictured here).

Ostra-Allee,  a street leading from the square Postplatz to Yenidze. In 1744 replaced with a proper road what was probably just a little lane. On the Ostra Allee are the sights Zwinger, Schauspielhaus, the park Herzogin Garten, several Theatre work shops, the Media House and the Hotel Art'otel (since 2018: Penck Hotel) with a sculpture by A.R.Pencks on the roof top.

Opposite of the "Zwinger" the office building "Offico" was established in 1993-95 after plans by Bernhard Winking. It closes directly to the building of the Dresdner Bank (in 1916 established as House of the Kaufmannschaft) on.

Ostra-Park,  Event location in the Ostragehege opposite the Messe Dresden with the Erlwein-Forum.

With the development and renovation of listed buildings opposite the main entrance to the Dresden Trade Fair, a location for unprecedented event concepts is being created on historical ground. The connection of spacious green areas, lake house, lake stage and the “Erlwein-Capitol” event hall. with 1,200 m² of usable space is unique in the region.

Ostragehege,  an artificial island between the bend of the river Elbe and the so called flood channel and is pre-dominated by the area of the former Slaughter House. The area, which was created in 1910 bei Hans Erlwein, consisted at its opening of 68 buildings- slaughter halls, offices, flats and a restaurant. Since 1995 no slaughter took place. And hopes to use the area during the IGA 2003 (a special fair) were shattered when the City of Dresden with drew its application to host the IGA 2003.
Now large parts are used during the annual fair called Messe Dresden (fair). Old building were restored for this purpose and the newly built ones blend it nicely thanks to a attractive open space.
Ostsächsische Sparkasse Dresden,  Sparkasse of the state capital Dresden and the districts Bautzen (western part).

It was created in 2004 from the merger of Stadtsparkasse Dresden and Sparkasse Elbtal-Westlausitz. The latter was created in 2003 through the merger of the district savings banks of what were then Dresden's neighboring districts, Weißeritzkreis, Saxon Switzerland (Sparkasse Freital-Pirna) and Kamenz (Sparkasse Westlausitz).

The savings bank operates 101 branches and 51 self-service points.

Öffentlicher Personennahverkehr / Public Transportation,  Dresden has an extremely dense local transport network with a high frequency. The 12 Trams and the most important 6 Buslines (numbers 60) operate ) of the Dresdner Verkehrsbetriebe AG (DVB) in daytime traffic every 10 minutes. There are also 22 other city bus lines, some of which are operated by partners, 2 mountain railways, 3 Elbe ferries (all DVB), Dresden, city bus lines in neighboring cities as well as the 4 lines of the S-Bahn Dresden, a subsidiary of DB AG. Another special feature is the continuous night operation of important tram and bus lines with the traditional night meetings at Postplatz.  zum ÖPNV-Netz im Themenstadtplan von www.dresden.de