diff --git a/db/snapshot.h b/db/snapshot.h
index 9f1d664..817bb7b 100644
--- a/db/snapshot.h
+++ b/db/snapshot.h
@@ -25,7 +25,7 @@ class SnapshotImpl : public Snapshot {
   friend class SnapshotList;
 
   // SnapshotImpl is kept in a doubly-linked circular list. The SnapshotList
-  // implementation operates on the next/previous fields direcly.
+  // implementation operates on the next/previous fields directly.
   SnapshotImpl* prev_;
   SnapshotImpl* next_;
 
diff --git a/util/env_posix.cc b/util/env_posix.cc
index 8b8d9c8..8405909 100644
--- a/util/env_posix.cc
+++ b/util/env_posix.cc
@@ -242,7 +242,7 @@ class PosixMmapReadableFile final : public RandomAccessFile {
   // over the ownership of the region.
   //
   // |mmap_limiter| must outlive this instance. The caller must have already
-  // aquired the right to use one mmap region, which will be released when this
+  // acquired the right to use one mmap region, which will be released when this
   // instance is destroyed.
   PosixMmapReadableFile(std::string filename, char* mmap_base, size_t length,
                         Limiter* mmap_limiter)
@@ -756,7 +756,7 @@ class PosixEnv : public Env {
   // Instances are constructed on the thread calling Schedule() and used on the
   // background thread.
   //
-  // This structure is thread-safe beacuse it is immutable.
+  // This structure is thread-safe because it is immutable.
   struct BackgroundWorkItem {
     explicit BackgroundWorkItem(void (*function)(void* arg), void* arg)
         : function(function), arg(arg) {}
diff --git a/util/env_windows.cc b/util/env_windows.cc
index 9ffcd07..c6d439c 100644
--- a/util/env_windows.cc
+++ b/util/env_windows.cc
@@ -681,7 +681,7 @@ class WindowsEnv : public Env {
   // Instances are constructed on the thread calling Schedule() and used on the
   // background thread.
   //
-  // This structure is thread-safe beacuse it is immutable.
+  // This structure is thread-safe because it is immutable.
   struct BackgroundWorkItem {
     explicit BackgroundWorkItem(void (*function)(void* arg), void* arg)
         : function(function), arg(arg) {}