diff --git a/src/cmd/godoc/godoc.go b/src/cmd/godoc/godoc.go
index 20ebd31835..771c8e6165 100644
--- a/src/cmd/godoc/godoc.go
+++ b/src/cmd/godoc/godoc.go
@@ -170,7 +170,7 @@ func readDirList(filename string) ([]string, os.Error) {
 		return e == nil && isPkgDir(d)
 	}
 	list := canonicalizePaths(strings.Split(string(contents), "\n"), filter)
-	// for each parent path, remove all it's children q
+	// for each parent path, remove all its children q
 	// (requirement for binary search to work when filtering)
 	i := 0
 	for _, q := range list {
diff --git a/src/cmd/godoc/index.go b/src/cmd/godoc/index.go
index e0c89e7949..c724d71fb2 100644
--- a/src/cmd/godoc/index.go
+++ b/src/cmd/godoc/index.go
@@ -633,7 +633,7 @@ func (x *Indexer) addFile(filename string, goFile bool) (file *token.File, ast *
 	// this permits the direct mapping of suffix array lookup results to
 	// to corresponding Pos values.
 	//
-	// When a file is added to the file set, it's offset base increases by
+	// When a file is added to the file set, its offset base increases by
 	// the size of the file + 1; and the initial base offset is 1. Add an
 	// extra byte to the sources here.
 	x.sources.WriteByte(0)
diff --git a/src/cmd/ld/dwarf.c b/src/cmd/ld/dwarf.c
index 1c10dc7967..4ceb36d1f9 100644
--- a/src/cmd/ld/dwarf.c
+++ b/src/cmd/ld/dwarf.c
@@ -1209,7 +1209,7 @@ copychildren(DWDie *dst, DWDie *src)
 }
 
 // Search children (assumed to have DW_TAG_member) for the one named
-// field and set it's DW_AT_type to dwtype
+// field and set its DW_AT_type to dwtype
 static void
 substitutetype(DWDie *structdie, char *field, DWDie* dwtype)
 {
@@ -1698,7 +1698,7 @@ inithist(Auto *a)
 			// We could just fixup the current
 			// linehist->line, but there doesn't appear to
 			// be a guarantee that every 'Z' is preceded
-			// by it's own 'z', so do the safe thing and
+			// by its own 'z', so do the safe thing and
 			// update the stack and push a new Linehist
 			// entry
 			includestack[includetop].line =	 a->aoffset;
diff --git a/src/pkg/encoding/pem/pem.go b/src/pkg/encoding/pem/pem.go
index ebe57edc0e..12689b57b1 100644
--- a/src/pkg/encoding/pem/pem.go
+++ b/src/pkg/encoding/pem/pem.go
@@ -97,7 +97,7 @@ func Decode(data []byte) (p *Block, rest []byte) {
 
 	for {
 		// This loop terminates because getLine's second result is
-		// always smaller than it's argument.
+		// always smaller than its argument.
 		if len(rest) == 0 {
 			return nil, data
 		}
diff --git a/src/pkg/exp/datafmt/datafmt.go b/src/pkg/exp/datafmt/datafmt.go
index 10e4b54f94..b4f83a8edf 100644
--- a/src/pkg/exp/datafmt/datafmt.go
+++ b/src/pkg/exp/datafmt/datafmt.go
@@ -317,12 +317,12 @@ func newState(fmt Format, env Environment, errors chan os.Error) *State {
 	s.errors = errors
 	s.linePos = token.Position{Line: 1}
 
-	// if we have a default rule, cache it's expression for fast access
+	// if we have a default rule, cache its expression for fast access
 	if x, found := fmt["default"]; found {
 		s.default_ = x
 	}
 
-	// if we have a global separator rule, cache it's expression for fast access
+	// if we have a global separator rule, cache its expression for fast access
 	if x, found := fmt["/"]; found {
 		s.separator = x
 	}
diff --git a/src/pkg/net/fd_windows.go b/src/pkg/net/fd_windows.go
index 41d06120a5..f727696740 100644
--- a/src/pkg/net/fd_windows.go
+++ b/src/pkg/net/fd_windows.go
@@ -155,7 +155,7 @@ func (s *ioSrv) ExecIO(oi anOpIface, deadline_delta int64) (n int, err os.Error)
 	case 0:
 		// IO completed immediately, but we need to get our completion message anyway.
 	case syscall.ERROR_IO_PENDING:
-		// IO started, and we have to wait for it's completion.
+		// IO started, and we have to wait for its completion.
 	default:
 		return 0, &OpError{oi.Name(), o.fd.net, o.fd.laddr, os.Errno(e)}
 	}