Background: Early mobilization in the intensive care unit (ICU) is crucial for preventing complications; however, barriers to interprofessional information sharing can hinder its effectiveness. Objective: This qualitative descriptive study aimed to identify barriers to interprofessional information sharing in ICUs, focusing on early mobilization. Methods: Semi-structured interviews were conducted with 15 ICU physicians, nurses, and physiotherapists in two Japanese hospitals. Results: Six categories and 15 sub-categories involving barriers were identified. Categories were Inter-Professional Discussions, Recording Systems, Operationalizing Objective Evaluation Criteria, Understanding Other Professions, Differences in Terminology among Professions, and Staff Placement. Conclusions: Clinicians recognized barriers to information sharing about early mobilization in ICUs. Clear evaluation criteria, better accessibility of patient records, standardized record formats, and common language fostered through education can enhance collaboration and improve patient outcomes.