The present invention relates to a line connector (1) having two mutually separate flow paths for two fluid media, specifically one for a functional medium, in particular for a urea-water solution in an SCR catalytic converter system of a motor vehicle, and another for a temperature control medium for controlling the temperature of the functional medium. The line connector (1) is composed of a connector body (2) having at least three line connections, specifically at least a first connection (4) for a first line which conducts the functional medium, a second connection (6) for a second line which conducts the temperature control medium, and a third connection (8), which is designed as a double connection, for a double line (10) which is composed of an inner line (12) and an outer line (14) substantially coaxially surrounding said inner line (12). The third connection (8) has an inner connecting element (16) with an inner passage (24) and an outer connecting element (18) with an outer passage (26). The connector body (2) is formed in its interior such that the first and second connections (4, 6) merge separately from one another into the inner and outer passages (24, 26), respectively, of the third connection (8). The invention also relates to a line set comprising a line connector (1) according to the invention and at least one connected line for a fluid medium.