diff --git a/src/si/mod.rs b/src/si/mod.rs
index 6d288deb..efa9ea5d 100644
--- a/src/si/mod.rs
+++ b/src/si/mod.rs
@@ -145,6 +145,7 @@ system! {
         temperature_interval::TemperatureInterval,
         thermal_conductance::ThermalConductance,
         thermal_conductivity::ThermalConductivity,
+        thermal_resistance::ThermalResistance,
         thermodynamic_temperature::ThermodynamicTemperature,
         time::Time,
         torque::Torque,
diff --git a/src/si/thermal_resistance.rs b/src/si/thermal_resistance.rs
new file mode 100644
index 00000000..81731edd
--- /dev/null
+++ b/src/si/thermal_resistance.rs
@@ -0,0 +1,113 @@
+//! Thermal resistance (base unit kelvin per watt, kg⁻¹ · m⁻² · s³ · K).
+
+quantity! {
+    /// Thermal resistance (base unit kelvin per watt, kg⁻¹ · m⁻² · s³ · K).
+    quantity: ThermalResistance; "thermal resistance";
+    /// Dimension of thermal resistance, L⁻²M⁻¹T³Th (base unit kelvin per watt,
+    /// kg⁻¹ · m⁻² · s³ · K).
+    dimension: ISQ<
+        N2,     // length
+        N1,     // mass
+        P3,     // time
+        Z0,     // electric current
+        P1,     // thermodynamic temperature
+        Z0,     // ammount of substance
+        Z0>;    // luminous intensity
+    units {
+        @kelvin_per_yottawatt: prefix!(none) / prefix!(yotta); "K/YW", "kelvin per yottawatt",
+            "kelvins per yottawatt";
+        @kelvin_per_zettawatt: prefix!(none) / prefix!(zetta); "K/ZW", "kelvin per zettawatt",
+            "kelvins per zettawatt";
+        @kelvin_per_exawatt: prefix!(none) / prefix!(exa); "K/EW", "kelvin per exawatt",
+            "kelvins per exawatt";
+        @kelvin_per_petawatt: prefix!(none) / prefix!(peta); "K/PW", "kelvin per petawatt",
+            "kelvins per petawatt";
+        @kelvin_per_terawatt: prefix!(none) / prefix!(tera); "K/TW", "kelvin per terawatt",
+            "kelvins per terawatt";
+        @kelvin_per_gigawatt: prefix!(none) / prefix!(giga); "K/GW", "kelvin per gigawatt",
+            "kelvins per gigawatt";
+        @kelvin_per_megawatt: prefix!(none) / prefix!(mega); "K/MW", "kelvin per megawatt",
+            "kelvins per megawatt";
+        @kelvin_per_kilowatt: prefix!(none) / prefix!(kilo); "K/kw", "kelvin per kilowatt",
+            "kelvins per kilowatt";
+        @kelvin_per_hectowatt: prefix!(none) / prefix!(hecto); "K/hW", "kelvin per hectowatt",
+            "kelvins per hectowatt";
+        @kelvin_per_decawatt: prefix!(none) / prefix!(deca); "K/daW", "kelvin per decawatt",
+            "kelvins per decawatt";
+        @kelvin_per_watt: prefix!(none) / prefix!(none); "K/W", "kelvin per watt",
+            "kelvins per watt";
+        @kelvin_per_deciwatt: prefix!(none) / prefix!(deci); "K/dW", "kelvin per deciwatt",
+            "kelvins per deciwatt";
+        @kelvin_per_centiwatt: prefix!(none) / prefix!(centi); "K/cW", "kelvin per centiwatt",
+            "kelvins per centiwatt";
+        @kelvin_per_milliwatt: prefix!(none) / prefix!(milli); "K/mW", "kelvin per milliwatt",
+            "kelvins per milliwatt";
+        @kelvin_per_microwatt: prefix!(none) / prefix!(micro); "K/µW", "kelvin per microwatt",
+            "kelvins per microwatt";
+        @kelvin_per_nanowatt: prefix!(none) / prefix!(nano); "K/nW", "kelvin per nanowatt",
+            "kelvins per nanowatt";
+        @kelvin_per_picowatt: prefix!(none) / prefix!(pico); "K/pW", "kelvin per picowatt",
+            "kelvins per picowatt";
+        @kelvin_per_femtowatt: prefix!(none) / prefix!(femto); "K/fW", "kelvin per femtowatt",
+            "kelvins per femtowatt";
+        @kelvin_per_attowatt: prefix!(none) / prefix!(atto); "K/aW", "kelvin per attowatt",
+            "kelvins per attowatt";
+        @kelvin_per_zeptowatt: prefix!(none) / prefix!(zepto); "K/zW", "kelvin per zeptowatt",
+            "kelvins per zeptowatt";
+        @kelvin_per_yoctowatt: prefix!(none) / prefix!(yocto); "K/yW", "kelvin per yoctowatt",
+            "kelvins per yoctowatt";
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    storage_types! {
+        use crate::num::One;
+        use crate::si::power as p;
+        use crate::si::quantities::*;
+        use crate::si::temperature_interval as ti;
+        use crate::si::thermal_resistance as tr;
+        use crate::tests::Test;
+
+        #[test]
+        fn check_dimension() {
+            let _: ThermalResistance<V> = TemperatureInterval::new::<ti::kelvin>(V::one())
+                / Power::new::<p::watt>(V::one());
+        }
+
+        #[test]
+        fn check_power_ti_units() {
+            test::<ti::kelvin, p::yottawatt, tr::kelvin_per_yottawatt>();
+            test::<ti::kelvin, p::zettawatt, tr::kelvin_per_zettawatt>();
+            test::<ti::kelvin, p::exawatt, tr::kelvin_per_exawatt>();
+            test::<ti::kelvin, p::petawatt, tr::kelvin_per_petawatt>();
+            test::<ti::kelvin, p::terawatt, tr::kelvin_per_terawatt>();
+            test::<ti::kelvin, p::gigawatt, tr::kelvin_per_gigawatt>();
+            test::<ti::kelvin, p::megawatt, tr::kelvin_per_megawatt>();
+            test::<ti::kelvin, p::kilowatt, tr::kelvin_per_kilowatt>();
+            test::<ti::kelvin, p::hectowatt, tr::kelvin_per_hectowatt>();
+            test::<ti::kelvin, p::decawatt, tr::kelvin_per_decawatt>();
+            test::<ti::kelvin, p::watt, tr::kelvin_per_watt>();
+            test::<ti::kelvin, p::deciwatt, tr::kelvin_per_deciwatt>();
+            test::<ti::kelvin, p::centiwatt, tr::kelvin_per_centiwatt>();
+            test::<ti::kelvin, p::milliwatt, tr::kelvin_per_milliwatt>();
+            test::<ti::kelvin, p::microwatt, tr::kelvin_per_microwatt>();
+            test::<ti::kelvin, p::nanowatt, tr::kelvin_per_nanowatt>();
+            test::<ti::kelvin, p::picowatt, tr::kelvin_per_picowatt>();
+            test::<ti::kelvin, p::femtowatt, tr::kelvin_per_femtowatt>();
+            test::<ti::kelvin, p::attowatt, tr::kelvin_per_attowatt>();
+            test::<ti::kelvin, p::zeptowatt, tr::kelvin_per_zeptowatt>();
+            test::<ti::kelvin, p::yoctowatt, tr::kelvin_per_yoctowatt>();
+
+            fn test<
+                TI: ti::Conversion<V>,
+                P: p::Conversion<V>,
+                TR: tr::Conversion<V>>()
+            {
+                Test::assert_approx_eq(&ThermalResistance::new::<TR>(V::one()),
+                    &(TemperatureInterval::new::<TI>(V::one())
+                        / Power::new::<P>(V::one())));
+            }
+        }
+    }
+}