This document is an editorial titled "Hydrogel Surface/Coating for Smart Drug Delivery and Medical Devices." It discusses the use of multifunctional hydrogels in medical applications such as artificial organs, biomedical sensors, drug/gene delivery, and surface modification of medical devices. The document highlights five articles on this topic, including three original research articles and two review articles. The research articles cover topics such as drug delivery for treating cancers, controlled delivery of growth factors, and the use of hydrogels as scaffolds. The review articles discuss synthetic strategies for creating lubricating polymer gels/coatings and the application of chitosan hydrogels in tissue engineering. The document concludes by emphasizing the importance of functional hydrogels in smart drug delivery and medical device development.