Indonesian students who study in Singapore experience a lot of cultural shock. This happened because of the many differences in the education system between Indonesia and Singapore. This study aims to analyze the cultural shock experienced by Indonesian students in Singapore. The research applied a qualitative descriptive research method that using library research based on Sverre Lysgaard (1955) theory, some Indonesian students who are still in college and have also graduated from college in the last 5 years in Singapore became the object of research in the internet site “Quora” about how it's like studying in Singapore. The result shows that many Indonesian students experience cultural shock based on the opinions or comments given in the comments column. The percentage of stages experienced by Indonesian students shows that the honeymoon stage is 20%, frustration stage is 30%, adjustment stage is 20%, and also adaptation stage is 30%. There are many differences in the education system in Indonesia and Singapore which are the main challenges in getting an education, one of which is about activities in learning and the attendance system in class. Not only that, the support from the teaching workforce and language also triggered the Cultural shock experienced by Indonesian students studying in Singapore.