Evolution, as believed to answer the question of Man's origin, is not supported by facts. Evolution has not been repeatedly observed neither in nature nor a controlled environment. Darwin, in his own book, reminds us that this is but merely a theory.
The common definition of "fact"; "a thing that is known or proved to be true" - Evolution is proven and known to be true. If we're being pragmatic, not a lot of things are facts. However, I think we can say with enough certainty, evolution is a fact, without being too pragmatic.
"Fact" is defined as "a thing that is indisputably the case." (per google). Dispute exists - so Evolution is a theory, as is everything produced by science. In science, we refine theory as new evidence arises. Evolution is not a "fact" - but it is, indeed, the best explanation for what we see today.
Part of the argument we are having here is to determine if there are still legitimate disputes to be had, if not, evolution becomes closer to be coming a "fact". As well, pieces of a theory such as evolution can be disputable, while still remaining a "fact" as a whole.
A fact is "something that actually exists; reality; truth", and evolution is "change in the gene pool of a population from generation to generation by such processes as mutation, natural selection, and genetic drift."
Since that type of change in the gene pool actually exists, evolution is fact.