士绅化或绅士化（Gentrification），又译为中产阶层化、贵族化或缙绅化，是社会发展的其中一个可能现象，指一个旧社区从原本聚集低收入人士，到重建后地价及租金上升，引致较高收入人士迁入，并取代原有低收入者。士绅化的转变过程可能因着重建速度而需时多年，但引伸的结果是本区生活指数提高，原居住的低收入者最后可能反被新迁入的高收入者歧视，或引致原居住的低收入者不得不迁离往更偏远或条件更差的地区维持生活。该地区吸引了第一批高收入者迁入后，就转而成为吸引其他同阶层人士迁入聚居的引力，使士绅化过程越加快速。

Gentrification is a trend in urban neighborhoods, which results in increased property values and the displacing of lower-income families and small businesses. This is a common and controversial topic in urban planning. It refers to shifts in an urban community lifestyle and an increasing share of wealthier residents and/or businesses and increasing property values. Gentrification may be viewed as "correction" of blockbusting and urban flight as many gentrified neighborhoods of the present were once affluent neighborhoods of the past.