The invention relates to a heat exchanger for internal combustion engines, comprising a first elongated flow channel, for the passage of exhaust gases from the internal combustion engine, a second flow channel, arranged adjacent to the first flow channel, for passage of the exhaust gases, a line, separate from the second flow channel, for the passage of a medium, in particular, a coolant, whereby heat energy may be exchanged between the exhaust in the second flow channel and the medium in the line and heat energy may not be exchanged to a significant degree between the exhaust in the first flow channel and the medium in the line and a valve channel with an adjustable valve element, whereby a distribution of the exhaust gasses between the first flow channel and the second flow channel may be adjusted by means of adjustment of the valve. According to the invention, an advantageous heat exchanger with respect to the required fitted space and the exhaust flow may be achieved, whereby an input flow axis for the valve channel has a different flow axis from the flow axis of the first channel.