Belgium

There is no legislation.

Bulgaria

Children and young people are generally allowed to stay in public places, but some restrictions exist concerning the evenings and the type of the public places. According to the Child Protection Act, parents are obliged to accompany their children or to provide responsible full age person to accompany their children to 16 years of age on public places after 22.00 o’clock. The same responsibilities have other persons who take care for the raising and education of children. Otherwise sanctions are imposed to the parents and caregivers of children. If by not implementing this obligation parents and guardians leave the child without attention and enough care and with this endanger his phisical, mental or moral development, they are sanctioned with imprisonment to 1 year or probation, as well as with public reproach. If anyone allows from 22.00 o’clock to 6.00 o’clock an unaccompanied child, who has not reached 16 years of age in his commercial property, can be fined either in cash or with property sanction.

Denmark

There is no legislation about age or to be accompanied in public places.

Germany

There is no legislation unless there is a dangerous place for minors.
(JuSchG § 8). The residence determination is part of parental care. 

Estonia

Young person are allowed to stay in public places from 16 years.

Republic of Estonia Child Protection Act, § 23 Restriction of freedom of movement of minors

(1) Children are required to observe public order.

(2) It is prohibited for a minor under 16 years of age to be in a public place from 23.00 to 06.00 without being accompanied by an adult. During the period from 1 June to 31 August, it is prohibited for a minor to be in a public place from 00.00 to 05.00 without being accompanied by an adult.

(3) Local governments have the right to temporarily shorten the restriction of movement provided for in this section.

(4) Upon non-observance of the requirement provided for in this section, administrative liability shall be imposed pursuant to section 142 of the Code of Administrative Offences

Finland

There are no restrictions on this matter, at least no legal restrictions.

France

They are allowed to stay in public places.

However, curfews maybe passed by prefectures or municipalities. In these cases, a unaccompanied minor under 13 years of age must not stay in public places between 11pm and 6am. The administration court specify by adjudication nr. 235638 of 9. July 2001 (collection Lebon) that these measures will become lawful if the public place present a risk to the health, safety, education and mental development of a young person during night time.

United Kingdom

No legal provisions regarding the presence of children in such places

Greece

There is no legislation.

Ireland

There is no legislation. Nevertheless, minors should not be attract attention because of disturbance of the peace.

In addition, minors must not be drunk in public (Criminal Justice Act [Public Order] 1994).

If an unaccompanied child is in a public place in danger, the health authority can intervene (Child Care Act 1991).

Italy

Yes, this is allowed, but their ability to do so is of course subject to the control of their adult relatives, utilizing common sense, based on the age of the child and the assessment which the relevant adults have made as to the degree of independence exhibited by the child or adolescent, and furthermore with due regard for their estimation of the areas frequented by the children with a view towards the dangers existing in those places. The Civil Code states that minors are constantly subject to the responsibility of their adult relatives (see Article 30 of the Constitution and Articles 147, 316 and 333 of the Civil Code. While this principle does not expressly prohibit minors from moving around freely and independently, it imposes a duty upon their adult relatives to protect the minors and to ensure that no circumstances exist which may cause harm to the minors in the event of their own absence.

Croatia

Pursuant to the Family Act, parents must not leave a child of pre-school age without the supervision of a person older than sixteen. This Act also prescribes the right and obligation of parents to prohibit their child under sixteen years of age from going out at night without the escort of themselves or other adults whom they trust. Going out at night means going out between the hours of 11 p.m. and 5 a.m.

Latvia

The duty of parents is not to let children until 7 years of age stay unattended by adults or person not younger than 13 years.

A child who has not reached 16 years of age cannot stay in public places unattended by parent, guardian, foster family or other person authorized by them during the night time (the night time is regarded to start at 22.00 and end at 6.00).

Lithuania

There is no strict regulation on how long children/teens can stay in public places, but considering that, according to the law, the night time in Lithuania starts at 10 pm, it seems clear that after that hour it is really not suitable for children to be alone outside. Each municipality can also set its own rules on how long are children allowed to stay in public places.
Also, the Law on Fundamentals of the Protection of the Rights of the Child of the Republic of Lithuania states that a child under the age of 6, as well as a child with a disability, taking into account his or her special needs and maturity, is not to be left unattended without objective necessity without the care of persons over 14 years of age. Short-term (up to 15 minutes) leaving a child under the age of 6 in a safe environment with persons aged 7 to 13 who are able to take care of him/her is not considered to be left unattended.

Luxembourg

General presence in public places without accompaniment is not regulated by law. The rules governing the supervisory duty within the context of parental custody must be consulted in this regard. The scope of this parental supervisory duty decreases as the children increase in age. The Road Traffic Code (the Code de la Route) prohibits children under the age of 10 years from using bicycles on public roads. However, this prohibition does not apply for children ages 6 years and up who are accompanied by a person aged 15 years or higher or who are on the way to school or church, riding a distance of no more than one kilometer or in cases where public transportation is not available.

Malta

There is no age limit for the presence of minors in public places unaccompanied by an adult. However, § 247A defines conditions with respect to the liability of adults who are responsible for a child and who consistently fail to exercise the necessary care for a minor under the age of 12.

Netherlands

There is no legal restriction for minors to be in public places without parents or legal guardians. A local authority (cities, municipalities) can however issue a local order which allows for young children, who are on the streets in certain areas after a certain time (for instance 21.00) without supervision, to be brought back to their parents by the police.

Austria

A person under the age of 12 is in general allowed to stay unaccompanied in public places until 9 pm. 
A person under the age of 14 is in general allowed to stay unaccompanied in public places until 11 pm. In Salzburg, a person from the age of 12 till 14 years is also allowed to stay unaccompanied in public places until 11 pm.
The exception to both rules applies in Upper Austria. A person under the age of 14 years is allowed to stay unaccompanied in public places until 10 pm, while the same rules applies for a person under the age of 12.
A person between the age 14 and 16 years is in general allowed to stay unaccompanied in public places until 1 am. In Upper Austria, a person within the same age group can stay unaccompanied in public places until 12 pm.
From the age of 16 there are no restrictions in place. 
All restricted timeframes end at 5 am. However, all times are the regulatory framework. The legal guardian can always shorten the time to an earlier hour. If a legal guardian or person subject to supervision by the legal guardian accompanies a person under the age of 18, the given time period does not apply. Beyond the specified times, a person may be in public if there is an important reason such as going to work/education.
 

Poland

Pursuant to Article 43 of the Road Traffic Act of 20 June 1997, children aged 7 or less may only use the roads when accompanied by persons aged 10 and up (this does not applyfor the areas where the children live).

The parents (legal guardians) decide whether a child may be present in public places unaccompanied by an adult. In accordance with the Family and Custody Act of 25 February 1964 (Official Journal 1964, No. 9, Item 59, with subsequent amendments), the parents (legal guardians) bear responsibility for the safety of their children. Children are subject to parental supervision until they reach the age of majority. The duty of parental supervision particularly includes the right of the parents to have custody over the child's person and assets. This is to be performed in a manner consistent with the welfare of the child and the public (the interest of society at large).

Portugal

They are allowed to stay in public places provided that the risk is minimal or socially acceptable.

Parents will be accused of negligence if there is a specific dangerous situation (i.e. an accident) which would have been avoided by their presence.

Romania

There is still no information

Sweden

Yes, children at any age are allowed to stay in public places (streets and parks) without being accompanied by an adult.

Slovakia

In the Republic of Slovakia has not been any guidance or legislation in this field. It is, however, said that the municipality may issue generally binding regulations, which governs the area.

Slovenia

There is no legally fixed age in Slovenia on the national level before which children are allowed to stay in public places without being accompanied by their parents or legal guardians. Municipal decrees in several municipalities define that children under 15 or 16 years of age are not allowed to stay in public places unaccompanied by their parents or legal guardians.

Spain

In principle there is no legal prohibition for unaccompanied children in public places like streets, parks, squares, etc.

If children are very young and someone notes that they are alone too long without seeing any adult who takes over, or children, although older, are unaccompanied during school time or late at night, the police may intervene to locate the parents or to address to public social services. The legislation covers only the existence of a offense if it is found that the adults responsible for children have been abandoned or not cared for properly, but the children are alone in the street is not in most cases a sufficient indicator to qualify the abandonment. Local governments can, if they want, ban unaccompanied children being in the streets after certain hours at night.

Czech Republic

Family Code -zákon č. 94/1963 Sb. Zákon o rodině:

Parents are responsible for their children. However, in general children are allowed to stay in public places.

Hungary

There is no legislation. Parents will be responsible for their children, if these are minors.

Cyprus

There is no legislation. However in cases of homeless children, the Social Welfare Services will take all the necessary measures to provide the children and their families with shelter, within the framework of the protection and welfare of children.