Common Lisp has the Condition System [1] and that is not a continuation mechanism, though it may seem similar because you can stop a computation and resume it with a different value, for example. I think that to classify as a continuation, CL would just need to expose the condition system's internals to allow the user to choose how to "use" it, but as it is, you can't: the only way to use conditions is to have predefined handlers for them... I remember that this was an important difference because with delimited continuations you can implement stuff (like async/await I think - probably most Monads?) that you can't in CL's Condition Systems (I can't find the article talking about this right now, hopefully someone else can chip in).

[1] https://lisp-docs.github.io/cl-language-reference/chap-9/j-b...