The subject of this research is "Analysis of the spelling proficiency of students in the second cycle of general secondary education in Mozambique". The research was carried out in secondary schools in the urban area (Quelimane city) and in secondary schools in the rural area (Maganja da Costa), Zambezia province, Mozambique. The general aim of the research is to understand the spelling difficulties present in the essays of secondary school students belonging to the ESG (11th and 12th grades). The problems referred to here are phonic errors, graphematic errors, morphological errors and accentuation errors. Keywords: Portuguese, Secondary Education, Error, Writing, Spelling.