This research aims to investigate, rationalize and identify the issue of legal protection for informal workers which is in the critical category. Therefore, this article is entitled Legal Protection for Informal Sector Workers in Employment Development in Indonesia: Challenges and Opportunities. The research method used is a normative juridical approach, document study, using qualitative methods in analyzing data and using secondary data as the source. The results of this research found that Law Number 6 of 2023 concerning the Determination of Government Regulations instead of Law Number 2 of 2022 concerning Job Creation into Law (Undang-Undang Nomor 6 Tahun 2023 tentang Penetapan Peraturan Pemerintah Pengganti Undang-Undang Nomor 2 Tahun 2022 Tentang Cipta Kerja Menjadi Undang-Undang or UU 6/2023) does not regulate informal workers at all, so there is a vacuum in terms of legal protection for informal workers in Indonesia. Therefore, national legislation is needed regarding legal protection for informal workers, which essentially contains work agreements between employers and informal workers/labourers. In this way, the government and the legislature are expected to be able to establish regulations and legislation to protect informal and vulnerable workers amidst the increasing informalization of the labour market due to the impact of accelerated advances in information and communication technology.