Resumen: Research data on indexing policies in Brazilian and Portuguese school libraries are presented and dis- cussed. Legal and organizational contexts regarding these types of libraries are briefly described. The collection of empirical data was obtained by means of an inquiry that resulted in 150 questionnaires from Brazil and 406 from Portugal. Based on these samples, a generic identification of school libraries was carried out in terms of teaching levels and institutional/geographical integration. The existence of a catalog in the libraries was also determined. The use of the two main kinds of indexing languages (classification systems and verbal indexing languages) were identified as well as the existence of manuals designed to guide indexing procedures. Refer- ences are made to aspects related to the specificity and the number of terms/subjects selected for each docu- ment and the use of indexing norms by comparing both Brazilian and Portuguese realities. Idioma: Inglés Año: 2016 Publicado en: KNOWLEDGE ORGANIZATION 43, 4 (2016), 278-285 ISSN: 0943-7444 Factor impacto JCR: 0.831 (2016) Categ. JCR: INFORMATION SCIENCE & LIBRARY SCIENCE rank: 51 / 85 = 0.6 (2016) - Q3 - T2 Factor impacto SCIMAGO: 0.352 - Library and Information Sciences (Q2)