| Calorie reporting for restaurants | PL 111-148, § 4205 |
| Campaign expenditures and contributions | |
| Campaign financing | MGL c. 10, § 42 |
| Campus sexual violence act | MGL c. 6, § 168D & § 168E |
| Capital punishment | See: Law About the Death Penalty |
| CARE Act (Health care: Caregiver Advise, Record, Enable) | MGL c. 111, § 236 |
| Caregiver Authorization Affidavit | MGL c. 201F |
| Carjacking | MGL c. 265, § 21A |
| Castle Law | MGL c. 278, § 8A |
| Chapter 766 (special education) | |
| Checks, dishonored | MGL c. 93, § 40A |
| Child abandonment | MGL c. 119, § 39 |
| Child custody | See: Law About Child Custody |
| Child endangerment | MGL c. 265, § 13L |
| Child labor | See: Law About Child Labor |
| Child requiring assistance | |
| Child support | See: Law About Child Support |
| Child support (Children over 18) | See: Law About Child Support Over Eighteen |
| CHINS (Children in need of services). Now known as CRA (Child requiring assistance) | |
| Christian's Law (Drowning prevention) | |
| Circuit Breaker Tax Credit (Property tax credit for seniors) | MGL c. 62, § 6(k) |
| Citizen's arrest | Comm. v. Harris, 11 Mass. App. Ct. 165 (1981) |
| Civil & criminal commitment (Mental health laws) | MGL c. 123 |
| Civil motor vehicle infractions (CMVI) | Civil Motor Vehicle Assessment Schedule |
| Civil rights, punishment for violation | MGL c. 265, § 37 & § 39 |
| Civil rights, unlawful discrimination | MGL c. 151B |
| Civil rights, violation of constitutional rights | MGL c. 12, § 11H, § 11I, § 11J |
| Civil service | |
| Clean Waters Act | |
| CMVI (Civil Motor Vehicle Infractions) | Civil Motor Vehicle Assessment Schedule |
| COBRA | |
| Cockfighting | MGL c. 272, §§ 94-95 |
| Common day of rest law | Mass. Blue Laws |
| Common law marriage | While Massachusetts recognizes a valid common law marriage from another state, a common law marriage cannot be created in Massachusetts. |
| Community Preservation Act | MGL c. 44B |
| Community property | Mass. is not a community property state. See instead: Law About Divorce |
| Compulsory motor vehicle liability insurance | See: Law About Auto Insurance |
| Condominium conversion | St.1983, c. 527 |
| Condominiums | MGL c. 183A |
| Conflict of interest, public officials & employees | See: Law About Ethics |
| Consumer credit cost disclosure | MGL c. 140D |
| Consumer protection | See: Law About Consumer Protection |
| Continued without a finding | MGL c. 278, § 18 |
| Controlled substances (drugs & narcotics) | MGL c. 94C |
| CORI (Criminal Offender Record Information) | See: Law About Criminal Records |
| Cotto order | Commonwealth v. Cotto, 471 Mass. 97 (2015) |
| CRA (Child Requiring Assistance) | |
| Credit: Mass. Fair Credit Reporting Act | MGL c. 93, §§ 50-68 |
| Crime Victims Rights and Compensation | See: Law About Victims and Witnesses |
| Criminal & civil commitment (mental health laws) | MGL c. 123 |
| Criminal harassment ("Sandy's law") | MGL c. 265 |
| Crowdfunding | 950 CMR 14.402(B)(13)(o) |
| CROWN act | St. 2022, c. 117 |
| Custody of children | See: Law About Child Custody |