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So, I'm working creating a lamp... yes, newbie here.

After modeling for a bit, I noticed that my point of origin was no longer the center of my object:

enter image description here

How to I reset an object origin point to the center of it's geometry?

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Press Shift + Ctrl + Alt + C (perhaps the longest shortcut in Blender) and select Origin to Geometry. Or, instead, open the Toolshelf by pressing T and press the Set Origin button in the Tools tab, subsection Edit.

Depending on how you imagine the 'Center' of your object, you might instead want to choose Origin to Center of Mass. The difference is that it calculates the center point based on the volume of the mesh, rather than the average location of vertices as Origin to Geometry does.

Visually, the difference is this (blue dot is the new origin point):

to Geometry vs to Center of Mass

UPDATE for Blender 2.8

Press the Object button at the bottom of the 3D view and see the Set Origin... sub-menu:

                    

Here you can find both the Origin to Geometry and two similar Origin to Center of Mass options.

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    $\begingroup$ There are other four key shortcuts too, e.g. Ctrl Shift Alt M.. :P Anyway, I edited your answer, feel free to rollback if you disagree with my edits. $\endgroup$
    – gandalf3
    Jul 23 '14 at 19:29
  • $\begingroup$ Are you sure, that one doesn't seem to do anything $\endgroup$ Jul 24 '14 at 12:27
  • $\begingroup$ It selects non-manifold geometry in edit mode. $\endgroup$
    – gandalf3
    Jul 24 '14 at 19:09
  • $\begingroup$ Oh, nice; But I looked through the user preferences and found no such shortcut $\endgroup$ Jul 24 '14 at 19:16
  • $\begingroup$ It's there: pasteall.org/pic/74462 $\endgroup$
    – gandalf3
    Jul 24 '14 at 19:21
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Click on Set Origin, then click Origin to Geometry.

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  1. RMB RMB on the object in object-mode
  2. Select Set Origin
  3. Select Origin to Geometry.
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Other way if you want change arbitrary the center is selecting a face or a point, press Shift + S (move the cursor to this position) and from object mode set the origin to 3D cursor.

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To complete Someonewithpc's answer, since 2.8 you can manipulate the origin itself: go into the Options panel, enable the Transform Affect Only Origins option, now you can move (or rotate or scale) the origin. Don't forget to disable the option once you're glad:

enter image description here

enter image description here

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