西安，古称“长安”、“镐京”，是陕西省省会，地处关中平原中部，北濒渭河，南依秦岭，八水润长安。全市下辖10区3县，总面积10108平方公里。2014年末常住人口862.75万，其中城镇人口626.44万。

长安自古帝王都，其先后有西周、秦、西汉、新莽、西晋、前赵、前秦、后秦、西魏、北周、隋、唐13个王朝在西安地区建都（积年为1077年）。是中华文明和中华民族重要发祥地之一，丝绸之路的起点。丰镐都城、秦咸阳宫、兵马俑，汉未央宫、长乐宫，隋大兴城，唐大明宫、兴庆宫等勾勒出“长安情结”。

西安是中国最佳旅游目的地、全国文明城市之一，国家重要的科教中心，有两项六处遗产被列入《世界遗产名录》，分别是：秦始皇陵及兵马俑、大雁塔、小雁塔、唐长安城大明宫遗址、汉长安城未央宫遗址、兴教寺塔。拥有西安交通大学、西北工业大学、西安电子科技大学等7所985或211工程类大学。

Xi'an is the capital of Shanxi province in China and a sub-provincial city. As one of the most important cities in Chinese history, Xi'an is one of the Four Great Ancient Capitals of China for it has been the capital of 13 dynasties, including the Zhou, Qin, Han, and the Tang. Xi'an is also renowned for being the eastern terminus of the Silk Road and for the location of the Terracotta Army from Qin Dynasty. The city has more than 3,100 years of history. It was called Chang'an in ancient times.

Since 1990s, as part of the economic revival of interior China, especially the central and northwest regions, covering an area of over 10000 square kilometers, a population of about 8500000，in addition to a history of manufacturing and solid industrial establishments, Xi'an has become an important cultural, industrial and educational center of the central-northwest region, with facilities for research and development, national security and China's space exploration program.