diff --git a/intern/cycles/kernel/integrator/surface_shader.h b/intern/cycles/kernel/integrator/surface_shader.h
index 573a35f0808..19e1845ce67 100644
--- a/intern/cycles/kernel/integrator/surface_shader.h
+++ b/intern/cycles/kernel/integrator/surface_shader.h
@@ -179,8 +179,8 @@ ccl_device_inline void surface_shader_validate_bsdf_sample(const KernelGlobals k
                                                            const float2 org_roughness,
                                                            const float org_eta)
 {
-  /* Validate the the bsdf_label and bsdf_roughness_eta functions
-   * by estimating the values after a bsdf sample. */
+  /* Validate the #bsdf_label and #bsdf_roughness_eta functions
+   * by estimating the values after a BSDF sample. */
   const int comp_label = bsdf_label(kg, sc, wo);
   kernel_assert(org_label == comp_label);
 
diff --git a/intern/cycles/scene/light.cpp b/intern/cycles/scene/light.cpp
index 3a66d416093..e0e778f7414 100644
--- a/intern/cycles/scene/light.cpp
+++ b/intern/cycles/scene/light.cpp
@@ -569,10 +569,10 @@ void LightManager::device_update_tree(Device *,
    * To do so, we repeatedly move to the left child of the current node until we reach the leftmost
    * descendant, while keeping track of the right child of each node we visited by storing the
    * pointer in the `right_node_stack`.
-   * Once finished visiting the left subtree, we retrieve the the last stored pointer from
+   * Once finished visiting the left subtree, we retrieve the last stored pointer from
    * `right_node_stack`, assign it to its parent (retrieved from `left_index_stack`), and repeat
    * the process from there. */
-  int left_index_stack[32]; /* sizeof(bit_trail) * 8 == 32 */
+  int left_index_stack[32]; /* `sizeof(bit_trail) * 8 == 32`. */
   LightTreeNode *right_node_stack[32];
   int stack_id = 0;
   const LightTreeNode *node = light_tree.get_root();
diff --git a/intern/ghost/GHOST_C-api.h b/intern/ghost/GHOST_C-api.h
index 683c1af120c..d0fe64aedfa 100644
--- a/intern/ghost/GHOST_C-api.h
+++ b/intern/ghost/GHOST_C-api.h
@@ -1198,7 +1198,7 @@ int GHOST_XrGetControllerModelData(GHOST_XrContextHandle xr_context,
  * Get Vulkan handles for the given context.
  *
  * These handles are the same for a given context.
- * Should should only be called when using a Vulkan context.
+ * Should only be called when using a Vulkan context.
  * Other contexts will not return any handles and leave the
  * handles where the parameters are referring to unmodified.
  *
@@ -1234,7 +1234,7 @@ void GHOST_GetVulkanHandles(GHOST_ContextHandle context,
  * At the start of each frame the correct command buffer should be
  * retrieved with this function.
  *
- * Should should only be called when using a Vulkan context.
+ * Should only be called when using a Vulkan context.
  * Other contexts will not return any handles and leave the
  * handles where the parameters are referring to unmodified.
  *
@@ -1251,7 +1251,7 @@ void GHOST_GetVulkanCommandBuffer(GHOST_ContextHandle context, void *r_command_b
  * Gets the Vulkan back-buffer related resource handles associated with the Vulkan context.
  * Needs to be called after each swap event as the back-buffer will change.
  *
- * Should should only be called when using a Vulkan context with an active swap chain.
+ * Should only be called when using a Vulkan context with an active swap chain.
  * Other contexts will not return any handles and leave the
  * handles where the parameters are referring to unmodified.
  *
diff --git a/intern/ghost/GHOST_IContext.h b/intern/ghost/GHOST_IContext.h
index b046436a84f..aee06b9604c 100644
--- a/intern/ghost/GHOST_IContext.h
+++ b/intern/ghost/GHOST_IContext.h
@@ -44,7 +44,7 @@ class GHOST_IContext {
    * Get Vulkan handles for the given context.
    *
    * These handles are the same for a given context.
-   * Should should only be called when using a Vulkan context.
+   * Should only be called when using a Vulkan context.
    * Other contexts will not return any handles and leave the
    * handles where the parameters are referring to unmodified.
    *
diff --git a/intern/ghost/intern/GHOST_Context.h b/intern/ghost/intern/GHOST_Context.h
index 44a0937cc94..9350493d30d 100644
--- a/intern/ghost/intern/GHOST_Context.h
+++ b/intern/ghost/intern/GHOST_Context.h
@@ -139,7 +139,7 @@ class GHOST_Context : public GHOST_IContext {
    * Get Vulkan handles for the given context.
    *
    * These handles are the same for a given context.
-   * Should should only be called when using a Vulkan context.
+   * Should only be called when using a Vulkan context.
    * Other contexts will not return any handles and leave the
    * handles where the parameters are referring to unmodified.
    *
diff --git a/intern/ghost/intern/GHOST_WindowWayland.cpp b/intern/ghost/intern/GHOST_WindowWayland.cpp
index a0b2dae5b03..8d12862b505 100644
--- a/intern/ghost/intern/GHOST_WindowWayland.cpp
+++ b/intern/ghost/intern/GHOST_WindowWayland.cpp
@@ -114,7 +114,7 @@ struct GWL_Window {
    */
   wl_fixed_t scale_fractional = 0;
 
-  /** A temporary token used for the window to be notified of of it's activation. */
+  /** A temporary token used for the window to be notified of it's activation. */
   struct xdg_activation_token_v1 *xdg_activation_token = nullptr;
 
 #ifdef WITH_GHOST_WAYLAND_LIBDECOR
diff --git a/intern/itasc/kdl/utilities/rall2d.h b/intern/itasc/kdl/utilities/rall2d.h
index 66ab6118664..72659895d8a 100644
--- a/intern/itasc/kdl/utilities/rall2d.h
+++ b/intern/itasc/kdl/utilities/rall2d.h
@@ -174,7 +174,7 @@ class Rall2d
          friend INLINE Rall2d<T,V,S> operator +(S s,const Rall2d<T,V,S>& v);
          friend INLINE Rall2d<T,V,S> operator +(const Rall2d<T,V,S>& v,S s);
          friend INLINE Rall2d<T,V,S> operator -(S s,const Rall2d<T,V,S>& v);
-         friend INLINE INLINE Rall2d<T,V,S> operator -(const Rall2d<T,V,S>& v,S s);
+         friend INLINE Rall2d<T,V,S> operator -(const Rall2d<T,V,S>& v,S s);
          friend INLINE Rall2d<T,V,S> operator /(S s,const Rall2d<T,V,S>& v);
          friend INLINE Rall2d<T,V,S> operator /(const Rall2d<T,V,S>& v,S s);
 
diff --git a/intern/memutil/MEM_CacheLimiterC-Api.h b/intern/memutil/MEM_CacheLimiterC-Api.h
index 589c26abbb8..b1c0f3a1eb8 100644
--- a/intern/memutil/MEM_CacheLimiterC-Api.h
+++ b/intern/memutil/MEM_CacheLimiterC-Api.h
@@ -62,8 +62,8 @@ void delete_MEM_CacheLimiter(MEM_CacheLimiterC *This);
 /**
  * Manage object
  *
- * \param This: "This" pointer, data data object to manage.
- * \return CacheLimiterHandle to ref, unref, touch the managed object
+ * \param This: "This" pointer, data object to manage.
+ * \return The handle to reference/unreference & touch the managed object.
  */
 
 MEM_CacheLimiterHandleC *MEM_CacheLimiter_insert(MEM_CacheLimiterC *This, void *data);
diff --git a/source/blender/blenlib/BLI_offset_indices.hh b/source/blender/blenlib/BLI_offset_indices.hh
index aeeb92fc283..22c7666fd67 100644
--- a/source/blender/blenlib/BLI_offset_indices.hh
+++ b/source/blender/blenlib/BLI_offset_indices.hh
@@ -30,7 +30,7 @@ template<typename T> class OffsetIndices {
     BLI_assert(std::is_sorted(offsets_.begin(), offsets_.end()));
   }
 
-  /** Return the total number of elements in the the referenced arrays. */
+  /** Return the total number of elements in the referenced arrays. */
   T total_size() const
   {
     return offsets_.last();
diff --git a/source/blender/blenlib/intern/array_store.c b/source/blender/blenlib/intern/array_store.c
index 17a99eb047c..611e9eb0df1 100644
--- a/source/blender/blenlib/intern/array_store.c
+++ b/source/blender/blenlib/intern/array_store.c
@@ -156,7 +156,7 @@
 /**
  * Singe bytes (or boolean) arrays need a higher number of steps
  * because the resulting values are not unique enough to result in evenly distributed values.
- * Use more accumulation when the the size of the structs is small, see: #105046.
+ * Use more accumulation when the size of the structs is small, see: #105046.
  *
  * With 6 -> 22, one byte each - means an array of booleans can be combine into 22 bits
  * representing 4,194,303 different combinations.
diff --git a/source/blender/editors/space_node/node_group.cc b/source/blender/editors/space_node/node_group.cc
index 4e45e3073e1..34b2b0c5d0e 100644
--- a/source/blender/editors/space_node/node_group.cc
+++ b/source/blender/editors/space_node/node_group.cc
@@ -727,7 +727,7 @@ static void get_min_max_of_nodes(const Span<bNode *> nodes,
 }
 
 /**
- * Skip reroute nodes when finding the the socket to use as an example for a new group interface
+ * Skip reroute nodes when finding the socket to use as an example for a new group interface
  * item. This moves "inward" into nodes selected for grouping to find properties like whether a
  * connected socket has a hidden value. It only works in trivial situations-- a single line of
  * connected reroutes with no branching.
diff --git a/source/blender/gpu/GPU_shader_builtin.h b/source/blender/gpu/GPU_shader_builtin.h
index 3f08d64fa22..65721a07132 100644
--- a/source/blender/gpu/GPU_shader_builtin.h
+++ b/source/blender/gpu/GPU_shader_builtin.h
@@ -12,7 +12,7 @@
  * `INST` suffix means instance, which means the shader is build to leverage instancing
  * capabilities to reduce the number of draw-calls.
  *
- * For full list of parameters, search for the the associated #ShaderCreateInfo.
+ * For full list of parameters, search for the associated #ShaderCreateInfo.
  * Example: `GPU_SHADER_ICON` is defined by `GPU_SHADER_CREATE_INFO(gpu_shader_icon)`
  * Some parameters are builtins and are set automatically (ex: `ModelViewProjectionMatrix`).
  */
diff --git a/source/blender/gpu/GPU_texture.h b/source/blender/gpu/GPU_texture.h
index 2519b7f2c94..c6c7ee8883c 100644
--- a/source/blender/gpu/GPU_texture.h
+++ b/source/blender/gpu/GPU_texture.h
@@ -424,7 +424,7 @@ void GPU_unpack_row_length_set(uint len);
  * Update the content of a texture's base mip-map level (mip 0).
  * \a data_format is the format of the \a data . It needs to be compatible with the internal
  * texture storage.
- * The \a data should be be the size of the entire mip 0 level.
+ * The \a data should be the size of the entire mip 0 level.
  * \note This function only update the content of mip 0. Either specify other mips or use
  * `GPU_texture_update_mipmap_chain` to generate them if needed.
  */
@@ -434,7 +434,7 @@ void GPU_texture_update(GPUTexture *texture, eGPUDataFormat data_format, const v
  * Update the content of a region of a texture's base mip-map level (mip 0).
  * \a data_format is the format of the \a data . It needs to be compatible with the internal
  * texture storage.
- * The \a data should be be the size of the mip 0 level region.
+ * The \a data should be the size of the mip 0 level region.
  * \note This function only update the content of mip 0. Either specify other mips or use
  * `GPU_texture_update_mipmap_chain` to generate them if needed.
  *
@@ -455,7 +455,7 @@ void GPU_texture_update_sub(GPUTexture *texture,
  * Update the content of a texture's specific mip-map level.
  * \a data_format is the format of the \a pixels . It needs to be compatible with the internal
  * texture storage.
- * The \a data should be be the size of the entire \a mip_level .
+ * The \a data should be the size of the entire \a mip_level .
  */
 void GPU_texture_update_mipmap(GPUTexture *texture,
                                int mip_level,
diff --git a/source/blender/gpu/metal/mtl_shader.mm b/source/blender/gpu/metal/mtl_shader.mm
index c3d12a0e84b..283d0adedd8 100644
--- a/source/blender/gpu/metal/mtl_shader.mm
+++ b/source/blender/gpu/metal/mtl_shader.mm
@@ -792,7 +792,7 @@ MTLRenderPipelineStateInstance *MTLShader::bake_current_pipeline_state(
   return bake_pipeline_state(ctx, prim_type, pipeline_descriptor);
 }
 
-/* Variant which bakes a pipeline state based on an an existing MTLRenderPipelineStateDescriptor.
+/* Variant which bakes a pipeline state based on an existing MTLRenderPipelineStateDescriptor.
  * This function should be callable from a secondary compilation thread. */
 MTLRenderPipelineStateInstance *MTLShader::bake_pipeline_state(
     MTLContext *ctx,
diff --git a/source/blender/makesdna/DNA_ID.h b/source/blender/makesdna/DNA_ID.h
index 61333893a0f..b11f9bf7886 100644
--- a/source/blender/makesdna/DNA_ID.h
+++ b/source/blender/makesdna/DNA_ID.h
@@ -105,7 +105,7 @@ typedef struct IDPropertyUIDataString {
 typedef struct IDPropertyUIDataID {
   IDPropertyUIData base;
   /**
-   * #ID_Type. This type type is not enforced. It is just a hint to the ui for what kind of ID is
+   * #ID_Type. This type is not enforced. It is just a hint to the ui for what kind of ID is
    * expected. If this is zero, any id type is expected.
    */
   short id_type;