diff --git a/src/core/smallvec_type.hpp b/src/core/smallvec_type.hpp
--- a/src/core/smallvec_type.hpp
+++ b/src/core/smallvec_type.hpp
@@ -30,7 +30,7 @@ class SmallVector {
 protected:
 	T *data;       ///< The pointer to the first item
 	uint items;    ///< The number of items stored
-	uint capacity; ///< The avalible space for storing items
+	uint capacity; ///< The available space for storing items
 
 public:
 	SmallVector() : data(NULL), items(0), capacity(0) { }
@@ -93,7 +93,7 @@ public:
 	}
 
 	/**
-	 * Search for the first occurence of an item.
+	 * Search for the first occurrence of an item.
 	 * The '!=' operator of T is used for comparison.
 	 * @param item Item to search for
 	 * @return The position of the item, or End() when not present
@@ -107,7 +107,7 @@ public:
 	}
 
 	/**
-	 * Search for the first occurence of an item.
+	 * Search for the first occurrence of an item.
 	 * The '!=' operator of T is used for comparison.
 	 * @param item Item to search for
 	 * @return The position of the item, or End() when not present
@@ -121,7 +121,7 @@ public:
 	}
 
 	/**
-	 * Search for the first occurence of an item.
+	 * Search for the first occurrence of an item.
 	 * The '!=' operator of T is used for comparison.
 	 * @param item Item to search for
 	 * @return The position of the item, or -1 when not present
@@ -250,7 +250,7 @@ public:
 	/**
 	 * Get item "number" (const)
 	 *
-	 * @param index the positon of the item
+	 * @param index the position of the item
 	 * @return the item
 	 */
 	FORCEINLINE const T &operator[](uint index) const
@@ -262,7 +262,7 @@ public:
 	/**
 	 * Get item "number"
 	 *
-	 * @param index the positon of the item
+	 * @param index the position of the item
 	 * @return the item
 	 */
 	FORCEINLINE T &operator[](uint index)
diff --git a/src/core/sort_func.hpp b/src/core/sort_func.hpp
--- a/src/core/sort_func.hpp
+++ b/src/core/sort_func.hpp
@@ -38,7 +38,7 @@ static FORCEINLINE void QSortT(T *base, 
  * Type safe Gnome Sort.
  *
  * This is a slightly modifyied Gnome search. The basic
- * Gnome search trys to sort already sorted list parts.
+ * Gnome search tries to sort already sorted list parts.
  * The modification skips these.
  *
  * @note Use this sort for presorted / regular sorted data.
diff --git a/src/tree_map.h b/src/tree_map.h
--- a/src/tree_map.h
+++ b/src/tree_map.h
@@ -33,16 +33,16 @@ enum TreeType {
 	TREE_INVALID      = 0xFF, ///< An invalid tree
 };
 
-/**
+/*
  * Counts the number of treetypes for each landscape.
  *
  * This list contains the counts of different treetypes for each landscape. This list contains
  * 5 entries instead of 4 (as there are only 4 landscape types) as the sub tropic landscape
- * got two types of area, one for normal trees and one only for cacti.
+ * has two types of area, one for normal trees and one only for cacti.
  */
 static const uint TREE_COUNT_TEMPERATE    = TREE_SUB_ARCTIC - TREE_TEMPERATE;    ///< number of treetypes on a temperate map
 static const uint TREE_COUNT_SUB_ARCTIC   = TREE_RAINFOREST - TREE_SUB_ARCTIC;   ///< number of treetypes on a sub arctic map
-static const uint TREE_COUNT_RAINFOREST   = TREE_CACTUS     - TREE_RAINFOREST;   ///< number of treetypes for the 'rainforrest part' of a sub-tropic map
+static const uint TREE_COUNT_RAINFOREST   = TREE_CACTUS     - TREE_RAINFOREST;   ///< number of treetypes for the 'rainforest part' of a sub-tropic map
 static const uint TREE_COUNT_SUB_TROPICAL = TREE_TOYLAND    - TREE_SUB_TROPICAL; ///< number of treetypes for the 'sub-tropic part' of a sub-tropic map
 static const uint TREE_COUNT_TOYLAND      = 9;                                   ///< number of treetypes on a toyland map
 
diff --git a/src/viewport.cpp b/src/viewport.cpp
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -141,7 +141,7 @@ struct ViewportDrawer {
 	int foundation[FOUNDATION_PART_END];             ///< Foundation sprites (index into parent_sprites_to_draw).
 	FoundationPart foundation_part;                  ///< Currently active foundation for ground sprite drawing.
 	int *last_foundation_child[FOUNDATION_PART_END]; ///< Tail of ChildSprite list of the foundations. (index into child_screen_sprites_to_draw)
-	Point foundation_offset[FOUNDATION_PART_END];    ///< Pixeloffset for ground sprites on the foundations.
+	Point foundation_offset[FOUNDATION_PART_END];    ///< Pixel offset for ground sprites on the foundations.
 };
 
 static ViewportDrawer _vd;
@@ -297,7 +297,7 @@ static void SetViewportPosition(Window *
 	vp->virtual_left = x;
 	vp->virtual_top = y;
 
-	/* viewport is bound to its left top corner, so it must be rounded down (UnScaleByZoomLower)
+	/* Viewport is bound to its left top corner, so it must be rounded down (UnScaleByZoomLower)
 	 * else glitch described in FS#1412 will happen (offset by 1 pixel with zoom level > NORMAL)
 	 */
 	old_left = UnScaleByZoomLower(old_left, vp->zoom);
@@ -465,7 +465,7 @@ void HandleZoomMessage(Window *w, const 
 }
 
 /**
- * Shedules a tile sprite for drawing.
+ * Schedules a tile sprite for drawing.
  *
  * @param image the image to draw.
  * @param pal the provided palette.
@@ -868,7 +868,7 @@ static bool IsPartOfAutoLine(int px, int
 		case HT_DIR_Y:  return px == 0; // y direction
 		case HT_DIR_HU: return px == -py || px == -py - 16; // horizontal upper
 		case HT_DIR_HL: return px == -py || px == -py + 16; // horizontal lower
-		case HT_DIR_VL: return px == py || px == py + 16; // vertival left
+		case HT_DIR_VL: return px == py || px == py + 16; // vertical left
 		case HT_DIR_VR: return px == py || px == py - 16; // vertical right
 		default:
 			NOT_REACHED();
@@ -1085,7 +1085,7 @@ static void ViewportAddLandscape()
  * @param sign sign position and dimension
  * @param string_normal String for normal and 2x zoom level
  * @param string_small String for 4x and 8x zoom level
- * @param string_small_shadow Shadow string for 4x and 8x zoom level; or STR_NULL if no shadow
+ * @param string_small_shadow Shadow string for 4x and 8x zoom level; or #STR_NULL if no shadow
  * @param colour colour of the sign background; or 0 if transparent
  */
 void ViewportAddString(const DrawPixelInfo *dpi, ZoomLevel small_from, const ViewportSign *sign, StringID string_normal, StringID string_small, StringID string_small_shadow, uint64 params_1, uint64 params_2, Colours colour)
@@ -1499,7 +1499,7 @@ static inline void ClampViewportToMap(co
 	x = (-vx + vy) / 2;
 	y = ( vx + vy) / 4;
 
-	/* Remove centreing */
+	/* Remove centering */
 	x -= vp->virtual_width / 2;
 	y -= vp->virtual_height / 2;
 }
@@ -1529,7 +1529,7 @@ void UpdateViewportPosition(Window *w)
 		if (delta_x != 0 || delta_y != 0) {
 			if (_settings_client.gui.smooth_scroll) {
 				int max_scroll = ScaleByMapSize1D(512);
-				/* Not at our desired positon yet... */
+				/* Not at our desired position yet... */
 				w->viewport->scrollpos_x += Clamp(delta_x / 4, -max_scroll, max_scroll);
 				w->viewport->scrollpos_y += Clamp(delta_y / 4, -max_scroll, max_scroll);
 			} else {
diff --git a/src/window.cpp b/src/window.cpp
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -44,7 +44,7 @@ Window *_z_front_window = NULL;
 Window *_z_back_window  = NULL;
 
 /*
- * Window that currently have focus. - The main purpose is to generate
+ * Window that currently has focus. - The main purpose is to generate
  * FocusLost events, not to give next window in z-order focus when a
  * window is closed.
  */