The HR is a family of straight-3 12-valve and straight-4 16-valve automobile engines with continuously variable valve timing, involving development by Nissan (Aichi Kikai) and/or Renault, and also Mercedes-Benz in the case of the H5Ht/M282.

It is fitted to the following vehicles: The HR12DE is a 1.2 L (1,198 cc) naturally aspirated straight-three engine.

It produces 74 kW (99 hp; 101 PS) at 6000 rpm and 134.4 N⋅m (99 lbf⋅ft) at 4000 rpm and is fitted to the following vehicles: The HR16DE is a 1.6 L (1,598 cc) naturally aspirated gasoline straight-4 engine, 16 valve DOHC; EFI; with variable valve timing.

[6][7] The HR12DDR is a 1.2 L (1,198 cc) supercharged straight-3 engine, equipped with timing chain and direct injection.

Designed for small-car applications, this gasoline engine incorporates a variety of technologies to minimize CO2 emissions while providing practical levels of power output.

[2][8] Some of the pertinent features are: It is fitted to the following vehicles: The HR12DDV is a 1.2 L (1,199 cc) all-aluminium direct injected and variable geometry turbocharged straight-three engine 48V mHEV equipped with lifetime timing chain, 12v DOHC, VVT, variable displacement oil pump, electric driven water pump, with Bore Spray Coating, Stop-Start, and regenerative braking, Bore and stroke are 75.5 and 89.3 mm (2.97 and 3.52 in) respectively.

The HR12DDT is a 1.2 L (1,197 cc) all-aluminium direct injected and turbocharged straight-four engine equipped with lifetime timing chain, 16v DOHC, VVT, variable displacement oil pump, Stop-Start and regenerative braking, Bore: 72.2 mm (2.84 in), Stroke 73.1 mm (2.88 in).

[10] The HR10DE is a 1.0 L (999 cc) multi point injected, naturally aspirated, straight-3 engine.

The HR13DDT is a 1.3 L (1,332 cc) all-aluminium direct injected and turbocharged straight-four engine equipped with lifetime timing chain, 16v DOHC, VVT, variable displacement oil pump, Stop-Start, regenerative braking, and Bore Spray Coating system (as installed in Nissan GT-R models), Bore: 72.2 mm (2.84 in), Stroke 81.3 mm (3.20 in).

This engine is also rebranded as a Mercedes-Benz under the name "M282", adding cylinder deactivation technology.