The study examines the concept and practice of blessing in contemporary Christian churches and reflects on the possibilities of blessing same-sex couples. It emphasises the need to distinguish the blessing of a same-sex couple from the legal act of entering into a civil partnership. The purpose of the blessing is not to affirm or sanctify a particular life form but to bring a couple committed to an enduring relationship of love, respect and fidelity before God, promising his favour, grace and gifts. The study consists of three parts. First, it introduces the concept of blessing in the Old and New Testament. The second part discusses blessing from a contemporary practical theological perspective. It presents blessing as a gift and a task of the church community and as a key motif of casual services. It points to the specific linguistic form of blessing as opposed to prayer, wish and proclamation, presents blessing as an act of communication and reflects on the question of its content and effects. The third part deals with the question of who or what can be blessed and whether it is theologically legitimate to bless same-sex couples. It reflects on the possibility of blessing in the pastoral practice of the Roman Catholic Church, anchored in the declaration Fiducia supplicans, and in the liturgical practice of the Evangelical Church of Czech Brethren. It concludes with a summary of the findings.