The Ministério Público (Public Prosecution Service) is Portugal's independent state prosecution body, responsible for leading criminal investigations, bringing charges, and representing the public interest in court.

The MP operates autonomously from the government and the police, though it directs criminal investigations carried out by the Polícia Judiciária, PSP, and GNR. It is led by the Procurador-Geral da República (Attorney General), who is appointed by the President on the government's proposal.

The MP gets involved in high-profile cases including corruption, financial crime, and incidents of potential institutional negligence. It also defends the legality of government actions and protects citizens' fundamental rights through the courts.

The PJ (Polícia Judiciária) is Portugal's national criminal investigation police agency, founded in 1945. Operating under the Ministry of Justice and supervised by the Public Ministry (prosecutors), the PJ is a "higher criminal police body" specializing in serious and complex crimes. ​ Mission: The PJ assists judicial and prosecuting authorities by investigating terrorism, organized crime, homicide, kidnapping, drug trafficking, corruption, cybercrime, financial crime, and money laundering. It conducts forensic examinations, operates Portugal's Interpol and Europol liaison offices, and maintains specialized units including the National Counterterrorism Unit and National Anti-Corruption Unit. ​ Difference from PSP/GNR: While PSP (civilian urban police) and GNR (military rural police) focus on preventive policing, public order, and investigating minor crimes, the PJ exclusively handles serious crime investigation requiring specialized technical and scientific expertise. PSP and GNR report to the Ministry of Internal Affairs; PJ reports to the Ministry of Justice. PJ officers receive higher pay and prestige but face greater operational risk.

The PSP (Polícia de Segurança Pública) is Portugal's national civilian police force, founded in 1867. Responsible for defending Republican democracy and safeguarding internal security and citizens' rights, the PSP polices major cities—Lisbon, Porto, Faro—and large urban areas, covering only 4% of Portugal's territory but roughly half the population. Led by a National Director under the Ministry of Internal Affairs, its approximately 21,500 officers handle preventive policing, crime investigation, public order, airport security, diplomatic protection, private security regulation, firearms licensing, and border control (since 2023).​

PSP vs. GNR: The PSP is civilian with police-focused training and urban jurisdiction, while the GNR (Guarda Nacional Republicana) is military (gendarmerie) with military training, covering 96% of Portugal's rural and suburban territory. Both share core public safety missions but differ fundamentally in nature, training, and geographic responsibility.

ASAE is the Autoridade de Segurança Alimentar e Económica (Authority for Food and Economic Safety), Portugal’s agency responsible for food-safety inspections, market surveillance and enforcement against illegal economic activity. It can inspect premises, seize unsafe or non-compliant goods, issue fines and stop sales — so businesses, restaurants and importers must comply with its rules and consumers can report problems to it.

The PSP (Polícia de Segurança Pública) is Portugal's national civilian police force, founded in 1867. Responsible for defending Republican democracy and safeguarding internal security and citizens' rights, the PSP polices major cities—Lisbon, Porto, Faro—and large urban areas, covering only 4% of Portugal's territory but roughly half the population. Led by a National Director under the Ministry of Internal Affairs, its approximately 21,500 officers handle preventive policing, crime investigation, public order, airport security, diplomatic protection, private security regulation, firearms licensing, and border control (since 2023).​

PSP vs. GNR: The PSP is civilian with police-focused training and urban jurisdiction, while the GNR (Guarda Nacional Republicana) is military (gendarmerie) with military training, covering 96% of Portugal's rural and suburban territory. Both share core public safety missions but differ fundamentally in nature, training, and geographic responsibility.

The PJ (Polícia Judiciária) is Portugal's national criminal investigation police agency, founded in 1945. Operating under the Ministry of Justice and supervised by the Public Ministry (prosecutors), the PJ is a "higher criminal police body" specializing in serious and complex crimes. ​ Mission: The PJ assists judicial and prosecuting authorities by investigating terrorism, organized crime, homicide, kidnapping, drug trafficking, corruption, cybercrime, financial crime, and money laundering. It conducts forensic examinations, operates Portugal's Interpol and Europol liaison offices, and maintains specialized units including the National Counterterrorism Unit and National Anti-Corruption Unit. ​ Difference from PSP/GNR: While PSP (civilian urban police) and GNR (military rural police) focus on preventive policing, public order, and investigating minor crimes, the PJ exclusively handles serious crime investigation requiring specialized technical and scientific expertise. PSP and GNR report to the Ministry of Internal Affairs; PJ reports to the Ministry of Justice. PJ officers receive higher pay and prestige but face greater operational risk.

The GNR (Guarda Nacional Republicana) is Portugal's national gendarmerie—a military police force founded in 1911, with origins dating to 1801. With over 22,600 personnel, GNR patrols 94-96% of Portuguese territory, covering rural areas, medium towns, and highways. Members are military personnel subject to military law, responsible for public order, customs, coastal control, environmental protection (SEPNA), firefighting/rescue (GIPS), border control, and ceremonial guards. ​ GNR vs. PSP: The PSP (Polícia de Segurança Pública) is Portugal's civilian police force, covering major cities (Lisbon, Porto, Faro) and large urban areas—only 4% of territory but roughly half the population. PSP handles airport security, diplomatic protection, and private security regulation. Both share core missions (public order, crime prevention), but differ in nature: GNR is military with military training; PSP is civilian with police-focused training.