Rosenheim is a town in Bavaria, Germany. It is an independent town located in the centre of the district of Rosenheim (Upper Bavaria), and is also the seat of its administration. It is located on the west bank of the Inn at the confluence of the rivers Inn and Mangfall, in the Bavarian Alpine Foreland. It is the third largest city in Upper Bavaria with over 63,000 inhabitants. Rosenheim is the economic centre and the busiest place in the region.

The population of the town proper is approximately 60,000 inhabitants with up to 125,000 in the surrounding area. Rosenheim is situated in the Upper-Bavarian Alpine Foothills, 450 metres (1,476 feet) above sea level and covers an area of 37.52 square kilometres (14.49 sq mi). The capital of Bavaria, Munich, is 52 kilometres (32 miles) away in North-West direction from Rosenheim. Rosenheim station is at the junction of the Munich-Rosenheim, the Rosenheim-Salzburg and the Munich-Innsbruck lines.

The landscape around Rosenheim was formed during the last ice age from the advancement of the Inn Valley Glacier and later from the Rosenheim lake. The lake existed about 10,000 years ago, covering the whole Inn valley as far as Wasserburg am Inn, about 25 km (16 mi) north of Rosenheim.

Even today in many places around the town the former shoreline can be recognised where the former flat lake bed changes suddenly into relatively steep embankment.

Since 1885, the Mittertor [de] has housed the Municipal Museum with a large collection (about 5000 exhibits) of the cultural history of the town and district of Rosenheim, from the prehistory and early history and Roman times to the recent town history in the 20th century. It is one of the most important regional history collections in South East Upper Bavaria.

The Inn Museum houses the hydraulic engineering and marine technology collection of the Rosenheim Water Management Office and is located in the historic river master's Bruckbaustadel at the Inn Bridge. With many original objects, the museum displays the Inn Shipping Company, the source of Rosenheim's prosperity in the Middle Ages, in the past centuries. In addition, the museum provides facts about the river landscape and river engineering, geology, settlement history, marine engineering, bridge design and the development of waterways.

The Wood technology Museum was established in 1990 in the listed Ellmaierhaus. It is housed on the first floor, which is accessed via the so-called Jacob's ladder. At more than 400 square meters of exhibition space displays this unique museum, which is closely related to the timber town of Rosenheim and its training centres for wood occupations, wood as a raw material, its importance and processing past and present. The exhibition shows not only the end products, but also their production and the necessary tools. Regular special exhibitions complete the offer of the Wood technology Museum.

The Municipal Gallery of 1935-1937 was built by German Bestelmeyer. Every year, six art exhibitions are held here. In addition to contemporary art, also exhibitions of works from the 19th and 20th century are held. A thematic focus is the art from the region and the Munich School.

The Lokschuppen is an internationally renowned exhibition centre with annually changing exhibitions in the former railways round house.

The brine pump house is one of the few monuments in the town which recall time from 1810 to 1958 of Rosenheim's brine industry. As part of the National Exposition salt makes history, the town renovated the historic, listed building and set up an exhibition room about Rosenheim's brine history. Admission is only possible with town guides or by agreement with the Metropolitan Museum.

The Klepper museum houses various exhibits, on the one hand the history of the Klepper folding boat, coats and tents. On the other hand, it is also dedicated to the development of the company Klepper, who was once the biggest employer in Rosenheim.