The Federation of Protestant Churches in Italy (FCEI) is composed of churches, unions of churches and diaconal institutions, which consider themselves united by a common calling to witness and service (Statute, art. 1). Among the FCEI member churches (see below) are the main historic Protestant traditions in Italy, and some free churches from the Pentecostal-Charismatic area. Altogether the FCEI member churches comprehend about 65.000 people, i.e. about 20% of all Italian Protestants.

The Evangelical Lutheran Church in Italy (CELI) was founded in 1949, and has about 7.000 (mainly German-speaking) members and 12 congregations all over Italy. In doctrine, ethics and spiritual life the CELI is heir to Martin Luther and other theologians linked to the Reformation. The CELI's relations with the Italian State are outlined in the Intesa (Agreement) signed in 1995. The CELI is a member of the Lutheran World Federation (LWF), the Conference of European Churches (KEK) and the Community of Protestant Churches in Europe - Leuenberg Church Fellowship (CPCE), and has close relationships with the Evangelical Church in Germany (EKD) and the United Evangelical Lutheran Churches in Germany. The oldest Lutheran congregation in Italy was founded in Venice during the Reformation period, while the congregations in Trieste and Bolzano were founded respectively in 1778 and 1889 under the Augsburg regime.

The Waldensian church has its origins in the 12th century, when it began as a movement advocating poverty and freedom in preaching the Gospel, which joined the Protestant Reformation in 1532. Cruelly persecuted, the Waldensians survived by hiding in the Valleys of Piedmont in Northern Italy from the 16th century to 1848, when they were granted civil rights and began to spread all over the country. Today the Waldensian churches have about 30.000 members and are part of the World Alliance of Reformed Churches (WARC).

The Methodist Church began in the 18th century as a revival movement in the context of the Church of England and soon after spread in the USA and other countries. In the 19th century Methodist groups were established in Italy by English and American preachers in the context of the national building process. During the Fascist regime the American Methodist mission was greatly weakened and eventually merged into the British one. In 1961 the foundation of the Methodist Conference in Italy made the Italian Methodists fully independent of the British Methodist Conference. The Methodist churches currently have about 5.000 members all over Italy and are part of the World Methodist Council.

The Union of Methodist and Waldensian Churches was founded in 1979 when the two churches, whose co-operation had been increasing throughout the post-war period, signed an Integration Pact. The two churches are united in one Synod and share a common administration, a Faculty of Theology and ministers. The Union is a member of the World Council of Churches (WCC), the Conference of European Churches (KEK) and the Community of Protestant Churches in Europe - Leuenberg Church Fellowship (CPCE). Its relations with the Italian State are outlined in the Intesa (Agreement) signed in 1984.

The Salvation Army is a Christian movement, which was founded in 1865 by the English Methodist minister William Booth and has spread from England to 111 different countries all over the world. Its officers and members not only preach the Word of God, but also labour in various social activities (running schools, houses for children, shelters for the homeless, hospitals, humanitarian aid etc.). Responding to a recurrent theme in Christianity which sees the Church engaged in spiritual warfare, the movement adopted a quasi-military command structure with its headquarters in London and used to advantage certain soldierly features such as uniforms, flags and ranks. The Army spread to Italy in 1887, where it is still active nowadays with about 2.000 members in about 20 localities.

The Evangelical Christian Baptist Union in Italy (UCEBI) was founded in 1956 on the foundations of the Christian Apostolic Baptist Union (UCAB), which was set up in 1884 by Baptist missions coming from England and America in the 1860's. The Italian Baptists follow the basic doctrine of the Protestant Reformation, but they practice the baptism of only adult believers and have a congregational structure.
The UCEBI is a member of the World Baptist Alliance, the European Baptist Federation (EBF), the World Council of Churches (WCC) and the Conference of European Churches (KEK). It currently has 120 local churches all over the country, gathering 5.000 adult full members and 15.000 affiliates as a whole.

The Fellowship of Free Churches consists of a group of Free Evangelical Baptist churches mostly found in the Campania Region of Southern Italy, which have in common such traits as the literal interpretation of the Bible, the formal independence of the local congregations and the baptism of adult believers.

The Italian Apostolic Church located in Prato (Tuscany) is inspired by the independent Apostolic movement of Pentecostal background, which started in Wales in the 19th century in order to restore the purity of the Apostles' church. The Apostolic churches recognise the ministries of Apostles, Pastors, Prophets and Elders.

The Christian Congregation "Fiumi di Vita" ("Rivers of Life") in Naples is inspired by the Pentecostal movement, which started in the USA at the beginning of the 20th century as a popular revival characterized by the signs of the Holy Spirit. Pentecostalism spread in Italy between the 1920s and the 1950s; it was considered a cause of concern by the authorities and remained practically illegal until 1959.

The Evangelical Helvetic Congregation in Trieste takes its name from the 1566 "Confessio Helvetica Posterior", one of the most important documents of the Swiss Reformation.
The first Swiss people came to Trieste in 1751, and the Helvetic Congregation was officially founded in 1782. During the whole 19th century the Congregation was very active in culture and charity, but its membership was drastically reduced after the First World War because many businessmen moved out when Trieste lost its importance after becoming Italian. After the death of the last Helvetic pastor, in 1927 the Congregation signed a convention with the Waldensian church, which is still valid and guarantees that a Waldensian pastor takes care of the Helvetic Congregation.

St. Andrew's Church of Scotland in Rome is a Presbyterian English-speaking church, which was founded by the Scottish mission in 1862 as one of the first Protestant churches in Italy.