diff --git a/.github/ISSUE_TEMPLATE/bug_report.md b/.github/ISSUE_TEMPLATE/bug_report.md
index 8bb4dc9c19..387453b142 100644
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -25,7 +25,7 @@ Please put an X between the brackets as you perform the following steps:
 
 ### Context
 
-[Broader context that the issue occured in. If there was any prior discussion on [the Lean Zulip](https://leanprover.zulipchat.com), link it here as well.]
+[Broader context that the issue occurred in. If there was any prior discussion on [the Lean Zulip](https://leanprover.zulipchat.com), link it here as well.]
 
 ### Steps to Reproduce
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8f0c294f0b..5dcf6b05e8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -316,7 +316,7 @@ jobs:
           git fetch --depth=1 origin ${{ github.sha }}
           git checkout FETCH_HEAD flake.nix flake.lock
         if: github.event_name == 'pull_request'
-      # (needs to be after "Checkout" so files don't get overriden)
+      # (needs to be after "Checkout" so files don't get overridden)
       - name: Setup emsdk
         uses: mymindstorm/setup-emsdk@v12
         with:
diff --git a/script/lib/update-stage0 b/script/lib/update-stage0
index 10b5878a30..bb2daa3d59 100755
--- a/script/lib/update-stage0
+++ b/script/lib/update-stage0
@@ -17,7 +17,7 @@ for f in $(git ls-files src ':!:src/lake/*' ':!:src/Leanc.lean'); do
 done
 
 # special handling for Lake files due to its nested directory
-# copy the README to ensure the `stage0/src/lake` directory is comitted
+# copy the README to ensure the `stage0/src/lake` directory is committed
 for f in $(git ls-files 'src/lake/Lake/*' src/lake/Lake.lean src/lake/LakeMain.lean src/lake/README.md ':!:src/lakefile.toml'); do
     if [[ $f == *.lean ]]; then
         f=${f#src/lake}
diff --git a/src/kernel/instantiate_mvars.cpp b/src/kernel/instantiate_mvars.cpp
index b834bf2692..3f1adb614a 100644
--- a/src/kernel/instantiate_mvars.cpp
+++ b/src/kernel/instantiate_mvars.cpp
@@ -34,7 +34,7 @@ option_ref<level> get_lmvar_assignment(metavar_ctx & mctx, name const & mid) {
 class instantiate_lmvars_fn {
     metavar_ctx & m_mctx;
     std::unordered_map<lean_object *, level> m_cache;
-    std::vector<level> m_saved; // Helper vector to prevent values from being garbagge collected
+    std::vector<level> m_saved; // Helper vector to prevent values from being garbage collected
 
     inline level cache(level const & l, level r, bool shared) {
         if (shared) {
@@ -142,7 +142,7 @@ class instantiate_mvars_fn {
     instantiate_lmvars_fn m_level_fn;
     name_set m_already_normalized; // Store metavariables whose assignment has already been normalized.
     std::unordered_map<lean_object *, expr> m_cache;
-    std::vector<expr> m_saved; // Helper vector to prevent values from being garbagge collected
+    std::vector<expr> m_saved; // Helper vector to prevent values from being garbage collected
 
     level visit_level(level const & l) {
         return m_level_fn(l);
diff --git a/src/runtime/process.cpp b/src/runtime/process.cpp
index f6192f936c..9d74634edc 100644
--- a/src/runtime/process.cpp
+++ b/src/runtime/process.cpp
@@ -185,7 +185,7 @@ static obj_res spawn(string_ref const & proc_name, array_ref<string_ref> const &
     // This needs some thought, on Windows we must pass a command string
     // which is a valid command, that is a fully assembled command to be executed.
     //
-    // We must escape the arguments to preseving spacing and other characters,
+    // We must escape the arguments to preserving spacing and other characters,
     // we might need to revisit escaping here.
     for (auto arg : args) {
         command += " \"";
diff --git a/src/util/output_channel.h b/src/util/output_channel.h
index 4cf4b7484b..26fc5299ec 100644
--- a/src/util/output_channel.h
+++ b/src/util/output_channel.h
@@ -18,11 +18,11 @@ namespace lean {
 
     std::unique_ptr<output_channel> out;
     out = new stdout_channel();
-    (*out) << "writting to standard output";
+    (*out) << "writing to standard output";
     out = new stderr_channel();
-    (*out) << "writting to standard input";
+    (*out) << "writing to standard input";
     out = new file_output_channel("file.txt");
-    (*out) << "writting to file";
+    (*out) << "writing to file";
 */
 class output_channel {
 public: