Embodiments of a system and method for transactional memory (TM) with automatic object versioning are described. Embodiments described herein include a TM system and method that facilitates the execution of object-oriented application programs in a transactional environment, including automatically versioning objects to enhance efficiency. Embodiments of the TM automatically designate versions of objects using pointers, accurately identifying usable and unusable versions. Object versioning as described herein allows the garbage collector to easily and efficiently determine which objects may be moved, freeing memory space and reducing the number of objects traversed by a transaction before finding a useable version of an object. Other embodiments are described and claimed.