lex loci actus law of the place where the act occurred that gave rise to the legal claim. This is often confused with lex loci delicti commissi

Lex loci delicti commissi

The lex loci delicti commissi is the Latin term for "law of the place where the delict [tort] was committed" in the conflict of laws. Conflict of laws is the branch of law regulating all lawsuits involving a "foreign" law element where a difference in result will occur depending on which laws are...

which is where the tort is committed. While typically they both point to the same location, in the case of product liability, for example, the lex loci actus would be the place of manufacturing, while the lex loci delicti commissi would be the place of injury.