With the objective of investigating identity construction of teachers on strike through the observation of evaluative discourse in newspaper articles, this study analyses online articles, published by the newspapers O Globo and O Dia, during two periods in which the public school system of Rio de Janeiro entered on strike –from August to October, 2013 and from May to June, 2014. The investigation aims at discussing the following questions: 1) what identities of teachers on strike are constructed by the evaluative discourse of the newspaper articles? 2) how do the evaluative linguistic resources produce discourse which constructs these identities? 3) what ideological meanings are generated by the discourse of the articles analysed, suggesting relations of power and dominance involving teachers on strike? Adopting an interdisciplinary focus, the study is based on Martin s (2005) telelogical perspective of discourse genres; on the sociosemiotic approach to language proposed by Systemic-Functional Linguistics (Halliday, 1994), particularly on the resources of Appraisal Theory as well as on the tenets of Critical Discourse Analysis (Chouliaraki and Fairclough, 1999) and on the socioconstructionist theories of identity (Moita Lopes , 2003; Hall 2005; Bauman, 2005; Duszak 2002). Results suggest the construction of multiple identities of teachers on strike, most of them negative, such as: aggressive, riotous, troublemakers, uncompromising, irresponsible and, in a positive manner, courageous. Amongst the theoretical contributions of the study, it is highlighted the rich interface between social and critical linguistic approaches which understand the linguistic phenomenon as cultural and sociohistorically situated. Regarding my teaching practice –and that of other teachers from the public school system who recognise the strike as a legitimate right –, the study provided the reflection on how educators have their identities discursively constructed by journalists in the media.