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Mainz-Kastel is a district of the city Wiesbaden, which is the capital of the German state Hesse in western Germany. Kastel is the historical bridgehead of Mainz, the capital of the German state Rhineland-Palatinate and is located on the right side of the Rhine river. Kastel faces the historical center of Mainz and the two cities are connected by a road bridge. Kastel is located about one kilometer below the mouth of the river Main, where it flows into the Rhine. In its long history Kastel repeatedly belonged to Mainz and was formally incorporated into that city on 1 April 1908. Since Mainz was part of the French occupation zone (formed after World War II) and Kastel was part of the American occupation zone, the Americans ordered that Kastel be brought within the administration of Wiesbaden. On 25 July 1945, Kastel was incorporated into Wiesbaden, the Hessian state capital, and has been part of it ever since. The newly formed German federal states adapted the boundaries of the occupation zones. Therefore, Kastel is a district of Wiesbaden and part of the German state Hesse. Kastel is one of six districts of Mainz on the right-hand side of the Rhine which were separated from Mainz in this way. The separation from Mainz is the issue of intense debates by local patriots in three districts (Kastel, Amöneburg and Kostheim). Many Kastel residents feel like they belong to Mainz which reflects, apart from the administrative affiliation, the reality of everyday life. The city center of Wiesbaden is about ten kilometers from Kastel whereas the city center of Mainz is just on the opposite side of the Rhine. The three mentioned districts of Wiesbaden still bear the designation "Mainz- ..." because until today no closed formal legal act has been made up. The signs, when entering the districts, are a curiosity because they say "Federal State Capital Wiesbaden District Mainz-Kastel". On the other hand, many inhabitants of Kastel feel like they belong to the German state Hesse (Mainz was a part of the Grand Duchy of Hesse from 1815-World War II) and do not identify with Rhineland-Palatinate whatsoever. Adolphus Busch, founder of Anheuser-Busch, was born in Kastel (now Mainz-Kastel) in 1839. CB&I Lummus operated an office in Mainz-Kastel which has been bought by Alstom as of 30 October 2009.The letter processing center for Deutsche Post in the greater Wiesbaden area is located in Mainz-Kastel.

The Stadion in der Witz is a stadium in Mainz-Kastel, Wiesbaden, Germany, with a capacity of 5,000. It is currently used for football matches and is the home ground of FVgg Kastel 06.

Mainz-Kastel station is situated on the Frankfurt–Wiesbaden line (line number 3603; timetable section 645.1) in Mainz-Kastel, now a suburb of Wiesbaden, in the German state of Hesse. It was opened as part of the Taunus Railway, which was opened in 1839/40. The station was opened as part of the last stage of construction of the line to Wiesbaden and was opened on 19 May 1840. Kastel station is also served by the Regionalbahn service running between Neuwied and Frankfurt (RB 10) every hour. In the rush hour it extends to a half-hourly service.

The Theodor Heuss Bridge is an arch bridge over the Rhine River connecting the Mainz-Kastel district of Wiesbaden, capital of state Hesse and the Rhineland-Palatinate state capital Mainz. The main span of the bridge is 102.94 meters (337.7 ft) long. It connects the Bundesstraßes 40 and 455. Initially it was just called “Straßenbrücke” (street bridge), later it was named after German statesman Theodor Heuss. The Romans had built a bridge in this region in 27 AD, while the first arch bridge was inaugurated on 30 May 1885. Its construction costs of 3.6 million gold marks were recouped through tolls within three years although tolls continued to be levied until 1912. The bridge was widened from 1931 to 1934 but was destroyed on 17 March 1945 by German military engineers at the end of the second World War. To forestall a second Remagen, the Germans by 19 March had blown all Rhine bridges from Ludwigshafen northward. It was rebuilt in the years 1948 to 1950 and partially reconstructed between 1992 and 1995 for a cost of 139.5 million marks.

The Iron Tower (German: Eisenturm) is a mediaeval tower dating to the early 13th century, and modified in the 15th century, which with the Wood Tower and the Alexander Tower is one of three remaining towers from the city walls of Mainz, Germany. Its name derives from the Iron Market (Eisenmarkt), which was held in the immediate vicinity until the 19th century. The Iron Tower served as a watchtower and gate to the city, and later as a gaol. It was badly damaged in World War II and reconstructed in the 1960s. Today it houses various organizations and art projects and is used for art exhibitions.

The Gutenberg Museum is one of the oldest museums of printing in the world, located opposite the cathedral in the old part of Mainz, Germany. It is named after Johannes Gutenberg, the inventor of printing from movable metal type in Western Europe. The collections include printing equipment and examples of printed materials from many cultures.

The Wood Tower (German: Holzturm) is a mediaeval tower in Mainz, Germany, with the Iron Tower and the Alexander Tower one of three remaining towers from the city walls. Its current Gothic appearance dates to the early 15th century. It is so named because wood used to be piled next to it on the bank of the Rhine.Like the Iron Tower, the Wood Tower was used as a watchtower and gate-tower and later as a gaol. It was badly damaged in World War II and accurately reconstructed in 1961 for the two-thousandth anniversary of the city. It currently houses various organisations and clubs.

The Deutschhaus or Deutschordenskommende (German for "Commandry of the Teutonic Knights") is a historical building in Mainz, western Germany, which is the seat of the Rhineland-Palatinate Landtag.

The Old Arsenal (Altes Zeughaus), also referred to as Zum Sautanz, was the central arsenal of the fortress of Mainz during the 17th and 18th century. In his function it was succeeded by the new arsenal. Currently the renaissance building is used by the Rhineland-Palatinate state chancellery and the Landtag of Rhineland-Palatinate.

The Martinsburg is a former plains castle in Mainz. It lay on the banks of the Rhine, adjacent to the space where the Electoral Palace now stands.

Landbell AG für Rückhol-Systeme – or Landbell Group - is a service provider that carries out take-back and recycling obligations for companies. It supports companies in meeting their extended producer responsibility (EPR) obligations and other product and packaging related requirements. The company operates worldwide through its own network of producer responsibility organisations (PROs). Landbell Group's head office is located in Mainz.

The Liebfrauenplatz in Mainz is the easternmost of the four squares around Mainz Cathedral. It originally housed the Liebfrauenkirche (church of our Lady), which was demolished at the beginning of the 19th century and whose outline can still be seen today on the square, and marks the transition between the cathedral and the Rhine in the direction of the Fischtor, one of the eastward city gates.