The 2006 term of the Supreme Court of the United States began October 2, 2006, and concluded September 30, 2007. The table illustrates which opinion was filed by each justice in each case and which justices joined each opinion.
This was the second term of Chief Justice Roberts' tenure and the first full term with the same membership; Justice Alito joined the Court during the 2005 term.
| bgcolor=#DDDDDD | Roberts | Stevens | Scalia | Kennedy | Souter | Thomas | Ginsburg | Breyer | Alito | Most concordant justice | Least concordant justice | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chief Justice John Roberts | xx | 58.8% | 91.2% | 86.6% | 72.1% | 84.6% | 64.7% | 66.2% | 94.1% | Alito | Stevens | |
| Associate Justice John Paul Stevens | 58.8% | xx | 56.3% | 65.7% | 80.3% | 52.9% | 88.7% | 85.3% | 59.2% | Ginsburg | Thomas | |
| Associate Justice Antonin Scalia | 91.2% | 56.3% | xx | 78.6% | 67.6% | 92.9% | 64.8% | 67.2% | 87.3% | Thomas | Stevens | |
| Associate Justice Anthony Kennedy | 86.6% | 65.7% | 78.6% | xx | 77.1% | 78.3% | 71.4% | 76.5% | 92.9% | Alito | Stevens | |
| Associate Justice David Souter | 72.1% | 80.3% | 67.6% | 77.1% | xx | 62.9% | 85.7% | 91.4% | 67.6% | Breyer | Thomas | |
| Associate Justice Clarence Thomas | 84.6% | 52.9% | 92.9% | 78.3% | 62.9% | xx | 60.0% | 55.9% | 84.3% | Scalia | Stevens | |
| style=white-space:nowrap | Associate Justice Ruth Bader Ginsburg | 64.7% | 88.7% | 64.8% | 71.4% | 85.7% | 60.0% | xx | 90.0% | 62.0% | Breyer | Thomas |
| Associate Justice Stephen Breyer | 66.2% | 85.3% | 67.2% | 76.5% | 91.4% | 55.9% | 90.0% | xx | 62.3% | Souter | Thomas | |
| Associate Justice Samuel Alito | 94.1% | 59.2% | 87.3% | 92.9% | 67.6% | 84.3% | 62.0% | 62.3% | xx | Roberts | Stevens | |
Notes on statistics:
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