diff --git a/src/completion/katewordcompletion.cpp b/src/completion/katewordcompletion.cpp
--- a/src/completion/katewordcompletion.cpp
+++ b/src/completion/katewordcompletion.cpp
@@ -247,31 +247,57 @@
 ) const
 {
     KTextEditor::ViewPrivate *v = qobject_cast<KTextEditor::ViewPrivate *> (view);
+
+    const bool blockSelection = v->blockSelection() && v->selection();
+
+    KTextEditor::Range range = blockSelection ? (KTextEditor::Range(word.start(), v->selectionRange().end())) : word;
+
     if (v->config()->wordCompletionRemoveTail()) {
-        int tailStart = word.end().column();
-        const QString &line = view->document()->line(word.end().line());
-        int tailEnd = line.length();
-        for (int i = word.end().column(); i < tailEnd; ++i) {
-            // Letters, numbers and underscore are part of a word!
-            /// \todo Introduce configurable \e word-separators??
-            if (!line[i].isLetterOrNumber() && line[i] != QLatin1Char('_')) {
-                tailEnd = i;
+
+        v->doc()->replaceText(range, m_matches.at(index.row()), blockSelection);
+        v->doc()->editEnd();
+
+        if (blockSelection && !range.onSingleLine()) {
+            KTextEditor::Range selectionRange = view->selectionRange();
+            const int selectionEndColumn = selectionRange.end().column();
+            v->doc()->editStart();
+            for (int i = selectionRange.start().line(); i <= selectionRange.end().line(); ++i) {
+                const QString &line = v->doc()->line(i);
+                int tailEnd = line.length();
+                for (int j = selectionEndColumn; j < tailEnd; ++j) {
+                    // Letters, numbers and underscore are part of a word!
+                    /// \todo Introduce configurable \e word-separators??
+                    if (!line[j].isLetterOrNumber() && line[j] != QLatin1Char('_')) {
+                        tailEnd = j;
+                    }
+                }
+
+                v->doc()->removeText(KTextEditor::Range(KTextEditor::Cursor(i, selectionEndColumn), KTextEditor::Cursor(i, tailEnd)));
+            }
+        } else {
+            int tailStart = word.end().column();
+            const QString &line = view->document()->line(word.end().line());
+            int tailEnd = line.length();
+            for (int i = word.end().column(); i < tailEnd; ++i) {
+                // Letters, numbers and underscore are part of a word!
+                /// \todo Introduce configurable \e word-separators??
+                if (!line[i].isLetterOrNumber() && line[i] != QLatin1Char('_')) {
+                    tailEnd = i;
+                }
             }
-        }
 
-        int sizeDiff = m_matches.at(index.row()).size() - (word.end().column() - word.start().column());
+            int sizeDiff = m_matches.at(index.row()).size() - (word.end().column() - word.start().column());
 
-        tailStart += sizeDiff;
-        tailEnd += sizeDiff;
+            tailStart += sizeDiff;
+            tailEnd += sizeDiff;
 
-        KTextEditor::Range tail(KTextEditor::Cursor(word.start().line(), tailStart), KTextEditor::Cursor(word.end().line(), tailEnd));
+            KTextEditor::Range tail(KTextEditor::Cursor(word.start().line(), tailStart), KTextEditor::Cursor(word.end().line(), tailEnd));
 
-        view->document()->replaceText(word, m_matches.at(index.row()));
-        v->doc()->editEnd();
-        v->doc()->editStart();
-        view->document()->replaceText(tail, QString());
+            v->doc()->editStart();
+            view->document()->replaceText(tail, QString());
+        }
     } else {
-        view->document()->replaceText(word, m_matches.at(index.row()));
+        v->doc()->replaceText(range, m_matches.at(index.row()), blockSelection);
     }
 }
 
diff --git a/src/document/katedocument.cpp b/src/document/katedocument.cpp
--- a/src/document/katedocument.cpp
+++ b/src/document/katedocument.cpp
@@ -5173,7 +5173,14 @@
     // TODO more efficient?
     editStart();
     bool changed = removeText(range, block);
-    changed |= insertText(range.start(), s, block);
+
+    // handle text completion for multiline block selection
+    if (block && !range.onSingleLine()) {
+        changed |= typeChars(static_cast<KTextEditor::ViewPrivate *>(activeView()), s);
+    } else {
+        changed |= insertText(range.start(), s, block);
+    }
+
     editEnd();
     return changed;
 }