diff --git a/flang/lib/Lower/IntrinsicCall.cpp b/flang/lib/Lower/IntrinsicCall.cpp
--- a/flang/lib/Lower/IntrinsicCall.cpp
+++ b/flang/lib/Lower/IntrinsicCall.cpp
@@ -1019,6 +1019,8 @@
     // ceil is used for CEILING but is different, it returns a real.
     {"ceil", "llvm.ceil.f32", genF32F32FuncType},
     {"ceil", "llvm.ceil.f64", genF64F64FuncType},
+    {"cos", "llvm.cos.f32", genF32F32FuncType},
+    {"cos", "llvm.cos.f64", genF64F64FuncType},
     {"cosh", "coshf", genF32F32FuncType},
     {"cosh", "cosh", genF64F64FuncType},
     {"exp", "llvm.exp.f32", genF32F32FuncType},
@@ -1040,6 +1042,8 @@
     {"sign", "llvm.copysign.f64", genF64F64F64FuncType},
     {"sign", "llvm.copysign.f80", genF80F80F80FuncType},
     {"sign", "llvm.copysign.f128", genF128F128F128FuncType},
+    {"sin", "llvm.sin.f32", genF32F32FuncType},
+    {"sin", "llvm.sin.f64", genF64F64FuncType},
     {"sinh", "sinhf", genF32F32FuncType},
     {"sinh", "sinh", genF64F64FuncType},
     {"sqrt", "llvm.sqrt.f32", genF32F32FuncType},
diff --git a/flang/test/Lower/llvm-math.f90 b/flang/test/Lower/llvm-math.f90
--- a/flang/test/Lower/llvm-math.f90
+++ b/flang/test/Lower/llvm-math.f90
@@ -175,4 +175,44 @@
 ! CHECK-LABEL: func private @fir.sqrt.f64.f64(%arg0: f64)
 ! CHECK-NEXT:  %0 = fir.call @llvm.sqrt.f64(%arg0) : (f64) -> f64
 ! CHECK-NEXT:   return %0 : f64
+! CHECK-NEXT: }
+
+      SUBROUTINE COS_WRAPPER(IN, OUT)
+      REAL :: IN, OUT
+      OUT = COS(IN)
+      END SUBROUTINE
+
+! CHECK-LABEL: func private @fir.cos.f32.f32(%arg0: f32)
+! CHECK-NEXT:  %0 = fir.call @llvm.cos.f32(%arg0) : (f32) -> f32
+! CHECK-NEXT:   return %0 : f32
+! CHECK-NEXT: }
+
+      SUBROUTINE COSD_WRAPPER(IN, OUT)
+      REAL(KIND=8) :: IN, OUT
+      OUT = COS(IN)
+      END SUBROUTINE
+
+! CHECK-LABEL: func private @fir.cos.f64.f64(%arg0: f64)
+! CHECK-NEXT:  %0 = fir.call @llvm.cos.f64(%arg0) : (f64) -> f64
+! CHECK-NEXT:   return %0 : f64
+! CHECK-NEXT: }
+
+      SUBROUTINE SIN_WRAPPER(IN, OUT)
+      REAL :: IN, OUT
+      OUT = SIN(IN)
+      END SUBROUTINE
+
+! CHECK-LABEL: func private @fir.sin.f32.f32(%arg0: f32)
+! CHECK-NEXT:  %0 = fir.call @llvm.sin.f32(%arg0) : (f32) -> f32
+! CHECK-NEXT:   return %0 : f32
+! CHECK-NEXT: }
+
+      SUBROUTINE SIND_WRAPPER(IN, OUT)
+      REAL(KIND=8) :: IN, OUT
+      OUT = SIN(IN)
+      END SUBROUTINE
+
+! CHECK-LABEL: func private @fir.sin.f64.f64(%arg0: f64)
+! CHECK-NEXT:  %0 = fir.call @llvm.sin.f64(%arg0) : (f64) -> f64
+! CHECK-NEXT:   return %0 : f64
 ! CHECK-NEXT: }
diff --git a/flang/test/Lower/trigonometric-intrinsics.f90 b/flang/test/Lower/trigonometric-intrinsics.f90
--- a/flang/test/Lower/trigonometric-intrinsics.f90
+++ b/flang/test/Lower/trigonometric-intrinsics.f90
@@ -29,6 +29,34 @@
   z = atan(z)
 end subroutine
 
+! CHECK-LABEL: cos_testr
+subroutine cos_testr(a, b)
+  real :: a, b
+! CHECK: fir.call @fir.cos.f32.f32
+  b = cos(a)
+end subroutine
+
+! CHECK-LABEL: cos_testd
+subroutine cos_testd(a, b)
+  real(kind=8) :: a, b
+! CHECK: fir.call @fir.cos.f64.f64
+  b = cos(a)
+end subroutine
+
+! CHECK-LABEL: cos_testc
+subroutine cos_testc(z)
+  complex :: z
+! CHECK: fir.call @fir.cos.z4.z4
+  z = cos(z)
+end subroutine
+
+! CHECK-LABEL: cos_testcd
+subroutine cos_testcd(z)
+  complex(kind=8) :: z
+! CHECK: fir.call @fir.cos.z8.z8
+  z = cos(z)
+end subroutine
+
 ! CHECK-LABEL: cosh_testr
 subroutine cosh_testr(a, b)
   real :: a, b
@@ -57,6 +85,34 @@
   z = cosh(z)
 end subroutine
 
+! CHECK-LABEL: sin_testr
+subroutine sin_testr(a, b)
+  real :: a, b
+! CHECK: fir.call @fir.sin.f32.f32
+  b = sin(a)
+end subroutine
+
+! CHECK-LABEL: sin_testd
+subroutine sin_testd(a, b)
+  real(kind=8) :: a, b
+! CHECK: fir.call @fir.sin.f64.f64
+  b = sin(a)
+end subroutine
+
+! CHECK-LABEL: sin_testc
+subroutine sin_testc(z)
+  complex :: z
+! CHECK: fir.call @fir.sin.z4.z4
+  z = sin(z)
+end subroutine
+
+! CHECK-LABEL: sin_testcd
+subroutine sin_testcd(z)
+  complex(kind=8) :: z
+! CHECK: fir.call @fir.sin.z8.z8
+  z = sin(z)
+end subroutine
+
 ! CHECK-LABEL: sinh_testr
 subroutine sinh_testr(a, b)
   real :: a, b
@@ -97,6 +153,18 @@
 ! CHECK-LABEL: @fir.atan.z8.z8
 ! CHECK: fir.call {{.*}}atan
 
+! CHECK-LABEL: @fir.cos.f32.f32
+! CHECK: fir.call {{.*}}cos
+
+! CHECK-LABEL: @fir.cos.f64.f64
+! CHECK: fir.call {{.*}}cos
+
+! CHECK-LABEL: @fir.cos.z4.z4
+! CHECK: fir.call {{.*}}cos
+
+! CHECK-LABEL: @fir.cos.z8.z8
+! CHECK: fir.call {{.*}}cos
+
 ! CHECK-LABEL: @fir.cosh.f32.f32
 ! CHECK: fir.call {{.*}}cosh
 
@@ -109,6 +177,18 @@
 ! CHECK-LABEL: @fir.cosh.z8.z8
 ! CHECK: fir.call {{.*}}cosh
 
+! CHECK-LABEL: @fir.sin.f32.f32
+! CHECK: fir.call {{.*}}sin
+
+! CHECK-LABEL: @fir.sin.f64.f64
+! CHECK: fir.call {{.*}}sin
+
+! CHECK-LABEL: @fir.sin.z4.z4
+! CHECK: fir.call {{.*}}sin
+
+! CHECK-LABEL: @fir.sin.z8.z8
+! CHECK: fir.call {{.*}}sin
+
 ! CHECK-LABEL: @fir.sinh.f32.f32
 ! CHECK: fir.call {{.*}}sinh