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How can I replace the background of my scene, but keep the reflections and lighting generated from my HDRI?

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Enable Transparent in Render settings > Film:

Now the sky will render as alpha transparency when seen directly, but still illuminate and reflect off other objects.

Once you have a transparent background, it can easily be filled in with another image via an Alpha Over node:

enter image description here
The Translate node is used for some tweaks to the positioning of the background image.

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    $\begingroup$ Maybe it would be good to include a bit of information regarding compositing work involved. After all, the question was not about how to get a transparent background, but how to change the background without effecting the scene. $\endgroup$ – TARDIS Maker Jun 3 '15 at 7:07
  • $\begingroup$ Much better! Although for simplicities sake, I would get rid of the translate node, but that's just me. $\endgroup$ – TARDIS Maker Jun 5 '15 at 7:23
  • $\begingroup$ This was not helpful to me, can anyone please provide an video tutorial $\endgroup$ – Ehsan Zargar Ershadi Jun 15 '18 at 17:35
  • $\begingroup$ @EhsanZargarErshadi What is unclear? I can't really help unless I know where you're stuck. $\endgroup$ – gandalf3 Jun 15 '18 at 20:41
  • $\begingroup$ Sorry, my lake of knowledges where the issue, buy looking precisely to the images provided I was able to reproduce it. Thanks $\endgroup$ – Ehsan Zargar Ershadi Jun 17 '18 at 6:08

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