| Atlantic States Marine Fisheries Compact | 1940 |
| Bus Taxation Proration and Reciprocity Agreement | 1965 |
| Compact for Education | 1967 |
| Compact on Adoption and Medical Assistance | 1999 |
| Compact on Mental Health | 1955 |
| Connecticut River Atlantic Salmon Compact | 1979 |
| Connecticut River Valley Flood Control Compact | 1949 |
| Connecticut-New York Railroad Passenger Transportation Compact | 1967 |
| Connecticut-Rhode Island Boundary Compact | 1840 |
| Counseling Compact | 2023 |
| Driver License Agreement | 2004 |
| Driver License Compact | 1993 |
| 1993 |
| Emergency Management Assistance Compact | 2000 |
| International Emergency Management Assistance Compact | 2009 |
| Interstate Agreement on Detainers | 1957 |
| Interstate Agreement on Qualifications of Educational Personnel | 1969 |
| Interstate Compact for Adult Offender Supervision | 1951 |
| Interstate Compact for Juveniles | 1957 |
| Interstate Compact For Mutual Military Aid In An Emergency | 1953 |
| Interstate Compact on Adoption and Medical Assistance | 1999 |
| Interstate Compact on Educational Opportunity for Military Children | 2008 |
| Interstate Compact on the Placement of Children | 1967 |
| Interstate Corrections Compact | 1973 |
| Interstate Insurance Product Regulation Compact | |
| Interstate Library Compact | 1967 |
| Interstate Medical Licensure Compact | 2022 |
| Massachusetts-Connecticut Boundary establishment | 1801 |
| Multistate Lottery Agreement | 1995 |
| National Crime Prevention and Privacy Compact | 2000 |
| National Popular Vote Interstate Compact | 2018 |
| New England Higher Education Compact | 1955 |
| New England Interstate Corrections Compact | 1958 |
| New England Interstate Planning Compact | 1967 |
| New England Interstate Water Pollution Control Compact | 1949 |
| New England Police Compact | 1967 |
| New England Radiological Health Protection Compact | 1969 |
| New York-Connecticut Boundary Agreement | 1880 |
| Nonresident Violator Compact | 1981 |
| Northeast Interstate Low-Level Radioactive Waste Management Compact (Atlantic Compact) | 1983 |
| Northeastern Interstate Forest Fire Protection Compact | 1949 |
| 1949 |
| Physical Therapy Licensure Compact | 2023 |
| Psychology Interjurisdictional Compact | 2022 |
| State Authorization Reciprocity Agreement | 2016 |
| Thames River Flood Control Compact | 1957 |
| Tri-State Sanitation Compact | 1941 |
| Wildlife Violator Compact | 2013 |