Location
Panel
Properties ‣ Object ‣ Transform ‣ Origin Align

Actions
Align Origin
Snaps the origin of selected object(s) to the side of the model specified or to the grid. Exactly how it does this is decided by the settings

Settings
Alignment
Side of the mesh to align the origin to. Top, Bottom, etc… it uses the world X, Y, Z to determine what is forward (X, front; Y, right; Z, up)
Center First
Centers the object origin on the center of the object’s bounds before snapping. This can be seen as similar to ‘resetting’ the origin point before snapping occurs

Origin Align: Smart variant
Smart Center
Enables the smart center feature, measuring the locations of the vertices to find the optimal ‘center’ point. So for example snapping to the Top will get the vertex with the highest Z value and find the average bounds location of all vertices with the same Z value

Precision
Rounds the vertex locations to this number of decimal places. Blender appears to struggle at high precision, and usually a precision of 1 decimal place is adequate anyway