Anonymised responses from 45 STEM researchers across Algerian universities (Google Forms, April–May 2026, administered in Arabic). Contains categorical background items (Part A), 31 Likert items across five sections (1 = strongly disagree to 5 = strongly agree; several items positively worded and reverse-scored in analysis), one multi-select reviewer-commentary item, and three open-ended items. Timestamps and the consent-confirmation column removed; respondents identified only as R01–R45. Supports the article "Challenges of Algerian STEM Researchers in English-Medium Scholarly Publishing" (Chergui & Boudinar). A README sheet documents the variables.