diff --git a/src/completion/katewordcompletion.cpp b/src/completion/katewordcompletion.cpp
--- a/src/completion/katewordcompletion.cpp
+++ b/src/completion/katewordcompletion.cpp
@@ -247,31 +247,73 @@
 ) const
 {
     KTextEditor::ViewPrivate *v = qobject_cast<KTextEditor::ViewPrivate *> (view);
+
+    const bool completeBlockSelection = v->blockSelection() && v->selection();
+
     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;
+        if (completeBlockSelection) {
+            KTextEditor::Range selectionRange1 = view->selectionRange();
+            // startLine and endLine are the same for both selectionRange{1,2}
+            const int startLine = selectionRange1.start().line();
+            const int endLine = selectionRange1.end().line();
+            // remove word from all lines in the block selection
+            v->doc()->removeText(KTextEditor::Range(word.start(), selectionRange1.end()), true);
+            // typeChars will take care of inserting the completion text
+            // on every line in the block selection
+            v->doc()->typeChars(v, m_matches.at(index.row()));
+            v->doc()->editEnd();
+
+            KTextEditor::Range selectionRange2 = view->selectionRange();
+            // this column is where all the tails would begin
+            const int selectionEndColumn = selectionRange2.end().column();
+            v->doc()->editStart();
+            for (int i = startLine; i <= endLine; ++i) {
+                const QString &line = view->document()->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());
+            view->document()->replaceText(word, m_matches.at(index.row()));
+            v->doc()->editEnd();
+            v->doc()->editStart();
+            view->document()->replaceText(tail, QString());
+        }
     } else {
-        view->document()->replaceText(word, m_matches.at(index.row()));
+        if (completeBlockSelection) {
+            // remove word from all lines in the block selection
+            v->doc()->removeText(KTextEditor::Range(word.start(), v->selectionRange().end()), true);
+            // typeChars will take care of inserting the completion text
+            // on the lines in the block selection
+            v->doc()->typeChars(v, m_matches.at(index.row()));
+        } else {
+            v->doc()->replaceText(word, m_matches.at(index.row()));
+        }
     }
 }