diff --git a/src/librustc/middle/resolve_lifetime.rs b/src/librustc/middle/resolve_lifetime.rs
index 6f40e17855a78255779a033ee4015b32323672f7..e7a03a9b7e17439ea4a1557ea9e1c026897d88b4 100644
--- a/src/librustc/middle/resolve_lifetime.rs
+++ b/src/librustc/middle/resolve_lifetime.rs
@@ -374,7 +374,7 @@ impl<'v, 'a> Visitor<'v> for GatherLabels<'a> {
         fn visit_expr(&mut self, ex: &'v ast::Expr) {
             if let Some(label) = expression_label(ex) {
                 for &(prior, prior_span) in &self.labels_in_fn[..] {
-                    // FIXME (#24278): non-hygienic comparision
+                    // FIXME (#24278): non-hygienic comparison
                     if label.name == prior.name {
                         signal_shadowing_problem(self.sess,
                                                  label.name,
@@ -420,7 +420,7 @@ fn check_if_label_shadows_lifetime<'a>(sess: &'a Session,
                 EarlyScope(_, lifetimes, s) |
                 LateScope(lifetimes, s) => {
                     for lifetime_def in lifetimes {
-                        // FIXME (#24278): non-hygienic comparision
+                        // FIXME (#24278): non-hygienic comparison
                         if label.name == lifetime_def.lifetime.name {
                             signal_shadowing_problem(
                                 sess,
@@ -677,7 +677,7 @@ fn check_lifetime_def_for_shadowing(&self,
                                         lifetime: &ast::Lifetime)
     {
         for &(label, label_span) in &self.labels_in_fn {
-            // FIXME (#24278): non-hygienic comparision
+            // FIXME (#24278): non-hygienic comparison
             if lifetime.name == label.name {
                 signal_shadowing_problem(self.sess,
                                          lifetime.name,
diff --git a/src/librustc_typeck/astconv.rs b/src/librustc_typeck/astconv.rs
index 694993cdc0aae29526a4f161472c215fda0568d1..677254238c03498143cda5e658a8c1c22bb45b98 100644
--- a/src/librustc_typeck/astconv.rs
+++ b/src/librustc_typeck/astconv.rs
@@ -1344,7 +1344,7 @@ pub fn ast_ty_arg_to_ty<'tcx>(this: &AstConv<'tcx>,
 }
 
 // Check the base def in a PathResolution and convert it to a Ty. If there are
-// associated types in the PathResolution, these will need to be seperately
+// associated types in the PathResolution, these will need to be separately
 // resolved.
 fn base_def_to_ty<'tcx>(this: &AstConv<'tcx>,
                         rscope: &RegionScope,
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index 1e6e9a7562a7c1be287fe5e69e42ff7f49dce460..444e5dea89a46c2079cabfe59d684d16e397bb08 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -944,7 +944,7 @@ fn clean(&self, cx: &DocContext) -> Generics {
         // a Sized bound, removing the bounds as we find them.
         //
         // Note that associated types also have a sized bound by default, but we
-        // don't actually konw the set of associated types right here so that's
+        // don't actually know the set of associated types right here so that's
         // handled in cleaning associated types
         let mut sized_params = HashSet::new();
         where_predicates.retain(|pred| {
diff --git a/src/libstd/sys/unix/process2.rs b/src/libstd/sys/unix/process2.rs
index 4e7c4d241f53209b2f0acbf99aef8a467d2d7ea8..6f3c0fd63aa6da6c64551e43ab3ae4167a5f0284 100644
--- a/src/libstd/sys/unix/process2.rs
+++ b/src/libstd/sys/unix/process2.rs
@@ -328,7 +328,7 @@ pub fn try_wait(&self) -> Option<ExitStatus> {
         }) {
             Ok(0) => None,
             Ok(n) if n == self.pid => Some(translate_status(status)),
-            Ok(n) => panic!("unkown pid: {}", n),
+            Ok(n) => panic!("unknown pid: {}", n),
             Err(e) => panic!("unknown waitpid error: {}", e),
         }
     }
diff --git a/src/rt/valgrind/valgrind.h b/src/rt/valgrind/valgrind.h
index af01dfd71a71c71907b7391a7a55975e6daaa91a..51f9de8edf057541e005040ad6da030a998070b9 100644
--- a/src/rt/valgrind/valgrind.h
+++ b/src/rt/valgrind/valgrind.h
@@ -5122,7 +5122,7 @@ VALGRIND_PRINTF_BACKTRACE(const char *format, ...)
 
 
 /* These requests allow control to move from the simulated CPU to the
-   real CPU, calling an arbitary function.
+   real CPU, calling an arbitrary function.
 
    Note that the current ThreadId is inserted as the first argument.
    So this call:
diff --git a/src/test/run-pass/issue-20616.rs b/src/test/run-pass/issue-20616.rs
index e6b256f7e8413888dcd7c9362666b284001bcb7f..d5b799710941bdb9a5c6aaf4e1e872fd46b9386c 100644
--- a/src/test/run-pass/issue-20616.rs
+++ b/src/test/run-pass/issue-20616.rs
@@ -32,7 +32,7 @@
 // type argument with trailing comma
 type TypeG<T> = Box<T,>;
 
-// trailing comma on liftime defs
+// trailing comma on lifetime defs
 type TypeH<'a,> = &'a ();
 
 // trailing comma on type argument