SciFinder 為美國化學索摘服務社(Chemical Abstracts Service, CAS) 開發之線上資訊檢索系統，可檢索期刊文獻、專利、化學物質與反應、合成方法等各類型科學資料。
SciFinder is the most comprehensive database for coverage of chemistry &amp; chemical engineering. It has the world's largest collection of organic and inorganic substance information. The web version of SciFinder provides integrated access to CAPlus, CAS Registry, CASREACT, CHEMLIST, and CHEMCATS which are produced by Chemical Abstracts Service, and to MEDLINE which is produced by the U.S. National Library of Medicine. Sources covered in SciFinder include 10,000 journals, patents from 61 patent authorities, book chapters, conference proceedings, dissertations, evaluated reference works, technical reports, as well as book reviews and biographical information.