Coimbra is a city and a municipality in Portugal. The population at the 2011 census was 143,397, in an area of 319.40 square kilometres (123.3 sq mi). The fourth-largest urban centre in Portugal (after Lisbon, Porto and Braga), it is the largest city of the district of Coimbra and the Centro Region. About 460,000 people live in the Região de Coimbra, comprising 19 municipalities and extending into an area of 4,336 square kilometres (1,674 sq mi).

Among the many archaeological structures dating back to the Roman era, when Coimbra was the settlement of Aeminium, are its well-preserved aqueduct and cryptoporticus. Similarly, buildings from the period when Coimbra was the capital of Portugal (from 1131 to 1255) still remain. During the late Middle Ages, with its decline as the political centre of the Kingdom of Portugal, Coimbra began to evolve into a major cultural centre. This was in large part helped by the establishment of the University of Coimbra in 1290, the oldest academic institution in the Portuguese-speaking world. Apart from attracting many European and international students, the university is visited by many tourists for its monuments and history. Its historical buildings were classified as a World Heritage site by UNESCO in 2013: "Coimbra offers an outstanding example of an integrated university city with a specific urban typology as well as its own ceremonial and cultural traditions that have been kept alive through the ages."

The wealth of the city rests mostly on the University of Coimbra with about 20,000 students - the city has a total of 35,000 higher education students considering the other higher education institutions based there - but also in shopping, technology and health sciences industry, administrative offices, financial services, law firms and specialized medical care. The city has many private clinics, medical offices and two large independent state hospital centres: the H.U.C. - Hospitais da Universidade de Coimbra, which is a university hospital, and the C.H.C. - Centro Hospitalar de Coimbra, which includes a general hospital. Coimbra has also the regional branch of the national cancer hospital – the I.P.O. - Instituto Português de Oncologia, as well as a military hospital. The Instituto Nacional de Medicina Legal, the state-run forensic science institute of Portugal, is headquartered in Coimbra.

Notable companies based in the municipality of Coimbra include software companies Critical Software and Ciberbit which have their global headquarters in the city, mechanical and electronics engineering company Active Space Technologies, telemetry and Machine to Machine company ISA, Cimpor's cement factory in Souselas (CIMPOR Souselas), the pan-European service facility of Olympus Corporation, the pharmaceuticals companies Bluepharma and BASI, the iron foundry Fucoli-Somepal and several ceramics, food processing (Probar produces cold meat products and Dan Cake produces sponge cakes and swiss rolls), textiles, wine, civil and engineering construction, architecture, public works and housing construction firms. Handicraft industry is well represented by traditional tapestry and pottery manufacture, and the surroundings of the city have besides forestry, dynamic horticulture production, vineyards and livestock raising. The Instituto Pedro Nunes (Pedro Nunes Institute), a business incubator, dynamically hosts several start-ups which are usually dedicated to technology-related businesses and became independent spin-off companies headquartered across the whole region. There is a move by municipal authorities to bring in more innovation and high-technology businesses, through initiatives such as the Coimbra Innovation Park, with the objective of promoting innovation and companies that promote research and development (such as nanotechnology company Innovnano, a subsidiary of Companhia União Fabril).

Coimbra has a fresh produce open-air market on every 7th and 23rd days of the month at Feira dos 7 e dos 23, and a large fresh produce market in downtown at Mercado D. Pedro V. The Baixa (downtown) of Coimbra has many coffeehouses and bakeries, and features several specialty shops selling all kind of products in typical old-fashioned architectural surroundings. Large commercial facilities with car park, include a medium-sized shopping center (CoimbraShopping); two larger shopping centers with hypermarket, restaurants, movie theaters and several shops with a selection of some of Portugal's and the world's most famous and stylish international brands include "Dolce Vita Coimbra" designed by the American planning and design firm, Suttle Mindlin and Forum Coimbra; and two retail parks found on the fringes of the city, offering an alternative to the busy city centre (Retail Park Mondego in Taveiro, and Coimbra Retail Park in Eiras). Dolce Vita Coimbra was the recipient of the 2006 MIPIM International Design Award; the 2006 ICSC International Design Award; and the 2006 ICSC European Design Award proving that Portugal and Coimbra offer both historical and thoroughly modern shopping experiences.