[en] This report provides an update of the 2005 state of ground stress report for the Ontario portion of the Canadian Shield. A database of 304 stress measurements has been assembled that includes 75 new measurements since 2005. The database covers a range of depths between 12 and 2,552 m below ground surface with measurement data obtained largely from operating mines in Ontario. A data screening process was followed that involved 5 acceptance criteria to assess quality and reduce uncertainty when establishing representative ground stress state equations. As a result of the data screening, the database supporting the analysis in this study was reduced to 199 entries. Consistent with past studies, the state of ground stress in Shield terrain is sub-divided into 3 Zones: i) the stress-relaxed zone (Domain 1; 0-300m); ii) the transitional zone (Domain 2; 300 - 600 m); iii) the undisturbed zone (Domain 3; 600-1500m). The best-fit relationships are developed for Domains 1 and 3 as evidence suggests the interpretations are robust and less sensitive to site specific conditions. Variability and uncertainty is highest in transitional stress Domain 2, which reveals a strong dependency on the local geologic setting. As recommended in 2005, stresses in Domain 2 can be assumed to increase linearly between Domains 1 and 3 for preliminary modelling and sub-surface design purposes. While this review has provided insight on the stress state within in the crystalline rocks of the Canadian Shield, direct measurements of ground stress magnitudes and orientations are required to provide site-specific estimates that further constrain stress state and reduce uncertainty. (author)