The Dallas Police Department, established in 1881, is the principal law enforcement agency serving the city of Dallas, Texas.

The department is headed by a chief of police who is appointed by the city manager who, in turn, is hired by the Dallas City Council. The city manager is not an elected official.

Primary responsibility for calls for police service are seven operations divisions based on geographical subdivisions of the city. Each operations division is commanded by a deputy chief of police. The divisions are designated Central, Northeast, Southeast, South Central, Southwest, Northwest and North Central and operate from facilities which are referred to as substations. Each operations division's geographical area is further subdivided into sectors which are composed of beats, each of which is normally patrolled by a uniformed officer or officers in a marked squad car. Calls for service are received primarily through the city's 9-1-1 system which is answered by a city-operated emergency communications center. Each substation also has an investigative unit with detectives who are assigned cases of burglary and theft which are committed within the area covered by their division.

Dallas ( /ˈdæləs/) is the third-largest city in the state of Texas and the ninth-largest in the United States. The Dallas-Fort Worth metroplex is the largest metropolitan area in the South and fourth-largest metropolitan area in the United States. Divided between Collin, Dallas, Denton, Kaufman, and Rockwall counties, the city had a population of 1,197,816 in 2010, according to the United States Census Bureau.

The city is the largest economic center of the 12-county Dallas–Fort Worth–Arlington metropolitan area (the DFW MSA) that according to the March 2010 U.S. Census Bureau release, had a population of 6,371,773. The metroplex economy is the sixth largest in the United States, with a 2010 gross metropolitan product of $374 billion.

Dallas was founded in 1841 and was formally incorporated as a city in February 1856. The city's economy is primarily based on banking, commerce, telecommunications, computer technology, energy, healthcare and medical research, transportation and logistics. The city is home to the third largest concentration of Fortune 500 companies in the nation. Located in North Texas and a major city in the American South, Dallas is the main core of the largest inland metropolitan area in the United States that lacks any navigable link to the sea.

A police officer (also known as a policeman or policewoman, and constable in some forces, particularly in the United Kingdom and other Commonwealth nations) is a warranted employee of a police force. In the United States, "officer" is the formal name of the lowest police rank; in many other countries "officer" is a generic term not specifying a particular rank, and the lowest rank is often "constable". Police officers are generally charged with the apprehension of criminals and the prevention and detection of crime, and the maintenance of public order. Police officers may be sworn to an oath, and have the power to arrest people and detain them for a limited time, along with other duties and powers.

Some police officers may also be trained in special duties, such as counter-terrorism, surveillance, child protection, VIP protection, and investigation techniques into major crime, including fraud, rape, murder and drug trafficking.

Responsibilities of a police officer are varied, and may differ greatly from within one political context to another. Typical duties relate to keeping the peace, law enforcement, protection of people and property, and the investigation of crimes. Officers are expected to respond to a variety of situations that may arise while they are on duty. Rules and guidelines dictate how an officer should behave within the community, and in many contexts restrictions are placed on what the uniformed officer wears. In some countries, rules and procedures dictate that a police officer is obliged to intervene in a criminal incident, even if they are off-duty. Police officers in nearly all countries retain their lawful powers, while off duty.