Disclosed are: a filter connection assembly (12) of a filter assembly (10) for fluid, in particular oil, fuel, water, urea solution, hydraulic fluid or air, in particular of an internal combustion engine, in particular of a motor vehicle, said filter assembly for connecting at least one filter (16) to at least one filter connection assembly (12); a filter assembly (10); and a connecting device (14). The connecting device (14) comprises at least one connecting part (24). The connecting part (24) has at least one attachment section (26) with which the connecting part is or can be fixedly connected to a connection base body (18) of the filter connection assembly (12). The at least one connecting part (24) has at least one connecting section (34) to which at least one corresponding filter sideconnecting element (42) on the side of the filter (16) is or can be connected. The at least one connecting part (24) has mechanically reinforcing properties in comparison to at least the region of the connection base body (18) with which it is fixedly connected. The at least one attachment section (26) extends with respect to a connection axis (22) of the connection between the at least one filter (16) and the at least one filter connection assembly (12), in the direction of which axis connecting forces can act radially and circumferentially between the at least one filter (16) and the at least one filter connection assembly (12) by means of the connecting device (14). The at least one attachment section (26) is attached to the connection base body (18) along the extent of said section ina force transmitting manner. The at least one connection part (24) is embedded in the connection base body (18), at least by means of the at least one attachment section (26), such that forces introduced via the filter (16) can be absorbed by the at least one connection part (24).