A length-adjustable connecting rod for a reciprocating piston engine, in particular for a reciprocating piston internal combustion engine, comprising: - a hydraulic length-adjusting apparatus for adjusting an effective connecting rod length of the connecting rod, - a control device (140, 240, 340, 440, 540) switchable between at least two switching states for controlling the lengthwise adjustment of the connecting rod, - wherein the length-adjusting apparatus comprises at least one hydraulic cylinder with a piston and a first hydraulic working chamber and second hydraulic working chamber, - wherein the control device (140, 240, 340, 440, 540) comprises at least one first valve and one second valve, - wherein the first valve of the control device (140, 240, 340, 440, 540) is connected or connectable to the first hydraulic working chamber of the length-adjusting apparatus in a fluid-communicating manner and the second valve to the second hydraulic working chamber, - wherein the first valve can be actuated by means of a first hydraulically actuatable adjusting piston able to move axially along a first adjusting axis and the second valve is actuatable by means of a second hydraulically actuatable adjusting piston able to move axially along a second adjusting axis, and - wherein the first adjusting axis of the first valve of the control device (140, 240, 340, 440, 540) differs from the second adjusting axis of the second valve of the control device (140, 240, 340, 440, 540), characterized in that the first adjusting axis of the first valve of the control device (140, 240, 340, 440, 540) and the second adjusting axis of the second valve of the control device (140, 240, 340, 440, 540) run parallel to a crankshaft axis, wherein preferably both respectively run parallel to the crankshaft axis with respect to a functional installed state of the connecting rod in a reciprocating piston engine, in particular a reciprocating piston internal combustion engine. - a hydraulic length-adjusting apparatus for adjusting an effective connecting rod length of the connecting rod, - a control device (140, 240, 340, 440, 540) switchable between at least two switching states for controlling the lengthwise adjustment of the connecting rod, - wherein the length-adjusting apparatus comprises at least one hydraulic cylinder with a piston and a first hydraulic working chamber and second hydraulic working chamber, - wherein the control device (140, 240, 340, 440, 540) comprises at least one first valve and one second valve, - wherein the first valve of the control device (140, 240, 340, 440, 540) is connected or connectable to the first hydraulic working chamber of the length-adjusting apparatus in a fluid-communicating manner and the second valve to the second hydraulic working chamber, - wherein the first valve can be actuated by means of a first hydraulically actuatable adjusting piston able to move axially along a first adjusting axis and the second valve is actuatable by means of a second hydraulically actuatable adjusting piston able to move axially along a second adjusting axis, and - wherein the first adjusting axis of the first valve of the control device (140, 240, 340, 440, 540) differs from the second adjusting axis of the second valve of the control device (140, 240, 340, 440, 540),