ThisvolumecontainstheproceedingsofATC2009,the6thInternationalConf- ence on Autonomic and Trusted Computing: Bringing Safe, Self-x and Organic Computing Systems into Reality. The conference was held in Brisbane, A- tralia, during July 7-9, 2009. The conference was technically co-sponsored by the IEEE and the IEEE Computer Society Technical Committee on Scalable Computing. ATC 2009 was accompanied by three workshops on a variety of research challenges within the area of autonomic and trusted computing. ATC 2009 is a successor of the First International Workshop on Trusted and Autonomic Ubiquitous and Embedded Systems (TAUES 2005, Japan), the International Workshop on Trusted and Autonomic Computing Systems (TACS 2006, Austria), the Third International Conference on Autonomic and Trusted Computing (ATC 2006,China), the 4th International Conference on Autonomic and Trusted Computing (ATC 2007, Hong Kong), and the 5th International Conference on Autonomic and Trusted Computing (ATC 2008, Norway) Computing systems including hardware, software, communication and n- worksaregrowingdramaticallyinbothscale andheterogeneity,becoming overly complex. Such complexity is getting even more critical with the ubiquitous permeation of embedded devices and other pervasive systems. To cope with the growing and ubiquitous complexity, autonomic computing focuses on se- manageable computing and communication systems that exhibit self-awareness, self-con?guration, self-optimization, self-healing, self-protection and other self-x operationsto the maximumextent possible without humaninterventionorgu- ance. Organiccomputingadditionallyemphasizesnatural-analogueconceptslike self-organization and controlled emergence. Any autonomic or organic system must be trustworthy to avoid the risk of losing control and to retain con?dence that the system will not fail.