Indented and unintended language biases and priorities in assessment are one of the most important sources of global and socio-economic inequality in science. The consequences affect researchers from all fields – especially social sciences and humanities – and citizens across all countries. According to the international CoARA Agreement on Reforming Research Assessment (1st core-commitment), “changes in assessment practices should enable recognition of the broad diversity of valuable contributions that researchers make to science and for the benefit of society… irrespective of the language in which they are communicated”. Recently established CoARA Working-Group on Multilingualism and Language Biases in Research Assessment aims to 1. raise awareness across all fields about the importance of “multilingualism in practice of science, in scientific publications and in academic communications” (UNESCO) 2. provide institutions with guidelines, toolbox and implementation proposal for recognizing, rewarding and incentivizing research carried out and communicated in all languages, and for addressing language biases in metrics, expert-assessment and rankings This presentation will discuss some of the CoARA WG challenges and potential impacts: promoting international excellence in research while ensuring equity, diversity and societal interaction across STEM and SSH fieldsprovide equal opportunities to researchers and institutions irrespective of research orientation and mission, or language competenciesensuring availability of high-quality, diverse, locally relevant research, knowledge transfer beyond academia and co-creation between researchers and other stakeholdersimplementation of Open Science and RRI policies by fostering inclusive and diverse communities, broadening participation in scientific endeavours, and strengthening democratic culture.