I you're talking about Segwit 2X then no.

Core has wanted Segwit for years. Now it's going to happen, but instead of people accepting Segwit (which they refused for years) they accepted Segwit2X = Segwit + 2MB blocks. The Segwit part is a tested piece of code (could still have bugs though), the 2X is untested, not made by Core, and Core is firmly against it.

Core has wanted Segwit for years as I said, and promoted it. When it will activate, clearly that will not be a fork. If another piece of software rejects Segwit blocks, that would be a fork. Later if a Segwit2X piece of software is deployed then that's another fork.