Education in Curriculum 2013 has to create and design learning for the 21 st century. 21st-century skills have to possess critical thinking, problem-solving, creativity, collaboration, communication, science literacy, etc. STEAMintegrated project-based learning consists of five aspects, namely science, technology, engineering, art, and mathematics, implemented with project-based teaching and learning activities. The research's objective is to observe the STEAM-integrated project-based learning model's effectiveness in improving students' 21st-century skills. The research method is qualitative-descriptive by reviewing twenty journals as the literature. Study shows that there are many Project Based Learning (PjBL) models built into STEAM that effectively enhance one of the skills in the 21st century. Therefore, future research must explore the implementation of STEAM-integrated project-based learning during the Covid-19 pandemic by developing e-learning material based on STEAM-PjBL that can be used in online learning.