diff --git a/USER_MANUAL.md b/USER_MANUAL.md
index d189bfc2..005c16e9 100644
--- a/USER_MANUAL.md
+++ b/USER_MANUAL.md
@@ -898,6 +898,7 @@ LDPC | Low Density Parity Check Codes - a family of powerful FEC codes
     * Update configuration of the Voice Keyer feature based on user feedback. (PR #730)
     * Add monitor volume adjustment. (PR #733)
     * Avoid modifying the audio device configuration without the user explicitly doing so. (PR #735)
+    * If provided by user, add config file to titlebar. (PR #738)
 3. Build system:
     * Allow overrriding the version tag when building. (PR #727)
     * Update wxWidgets to 3.2.5. (PR #731)
diff --git a/src/gui/dialogs/dlg_audiooptions.cpp b/src/gui/dialogs/dlg_audiooptions.cpp
index f196f723..0b512748 100644
--- a/src/gui/dialogs/dlg_audiooptions.cpp
+++ b/src/gui/dialogs/dlg_audiooptions.cpp
@@ -88,6 +88,11 @@ void AudioOptsDialog::buildTestControls(PlotScalar **plotScalar, wxButton **btnT
 //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=
 AudioOptsDialog::AudioOptsDialog(wxWindow* parent, wxWindowID id, const wxString& title, const wxPoint& pos, const wxSize& size, long style) : wxDialog(parent, id, title, pos, size, style)
 {
+    if (wxGetApp().customConfigFileName != "")
+    {
+        SetTitle(wxString::Format("%s (%s)", title, wxGetApp().customConfigFileName));
+    }
+    
     if (g_verbose) fprintf(stderr, "pos %d %d\n", pos.x, pos.y);
     audioEngineInit();
 
diff --git a/src/gui/dialogs/dlg_easy_setup.cpp b/src/gui/dialogs/dlg_easy_setup.cpp
index 1a484b19..136f3a40 100644
--- a/src/gui/dialogs/dlg_easy_setup.cpp
+++ b/src/gui/dialogs/dlg_easy_setup.cpp
@@ -55,6 +55,11 @@ EasySetupDialog::EasySetupDialog(wxWindow* parent, wxWindowID id, const wxString
     , serialPortTestObject_(nullptr)
     , hasAppliedChanges_(false)
 {    
+    if (wxGetApp().customConfigFileName != "")
+    {
+        SetTitle(wxString::Format("%s (%s)", title, wxGetApp().customConfigFileName));
+    }
+    
     // Create top-level of control hierarchy.
     wxPanel* panel = new wxPanel(this);
     wxBoxSizer* sectionSizer = new wxBoxSizer(wxVERTICAL);
diff --git a/src/gui/dialogs/dlg_filter.cpp b/src/gui/dialogs/dlg_filter.cpp
index e6b3f1e4..0bdb9700 100644
--- a/src/gui/dialogs/dlg_filter.cpp
+++ b/src/gui/dialogs/dlg_filter.cpp
@@ -59,6 +59,11 @@ extern wxMutex g_mutexProtectingCallbackData;
 FilterDlg::FilterDlg(wxWindow* parent, bool running, bool *newMicInFilter, bool *newSpkOutFilter,
                      wxWindowID id, const wxString& title, const wxPoint& pos, const wxSize& size, long style) : wxDialog(parent, id, title, pos, size, style)
 {
+    if (wxGetApp().customConfigFileName != "")
+    {
+        SetTitle(wxString::Format("%s (%s)", title, wxGetApp().customConfigFileName));
+    }
+    
     m_running = running;
     m_newMicInFilter = newMicInFilter;
     m_newSpkOutFilter = newSpkOutFilter;
diff --git a/src/gui/dialogs/dlg_options.cpp b/src/gui/dialogs/dlg_options.cpp
index 633dd6e2..563c2c58 100644
--- a/src/gui/dialogs/dlg_options.cpp
+++ b/src/gui/dialogs/dlg_options.cpp
@@ -44,6 +44,11 @@ extern wxConfigBase *pConfig;
 //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=
 OptionsDlg::OptionsDlg(wxWindow* parent, wxWindowID id, const wxString& title, const wxPoint& pos, const wxSize& size, long style) : wxDialog(parent, id, title, pos, size, style)
 {
+    if (wxGetApp().customConfigFileName != "")
+    {
+        SetTitle(wxString::Format("%s (%s)", title, wxGetApp().customConfigFileName));
+    }
+    
     sessionActive_ = false;
     
     wxPanel* panel = new wxPanel(this);
diff --git a/src/gui/dialogs/dlg_ptt.cpp b/src/gui/dialogs/dlg_ptt.cpp
index 2f598489..fc34bda3 100644
--- a/src/gui/dialogs/dlg_ptt.cpp
+++ b/src/gui/dialogs/dlg_ptt.cpp
@@ -48,6 +48,11 @@ extern wxConfigBase *pConfig;
 //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=
 ComPortsDlg::ComPortsDlg(wxWindow* parent, wxWindowID id, const wxString& title, const wxPoint& pos, const wxSize& size, long style) : wxDialog(parent, id, title, pos, size, style)
 {
+    if (wxGetApp().customConfigFileName != "")
+    {
+        SetTitle(wxString::Format("%s (%s)", title, wxGetApp().customConfigFileName));
+    }
+    
     wxPanel* panel = new wxPanel(this);
     
     wxBoxSizer* mainSizer = new wxBoxSizer(wxVERTICAL);
diff --git a/src/gui/dialogs/freedv_reporter.cpp b/src/gui/dialogs/freedv_reporter.cpp
index a0b687e3..4350646f 100644
--- a/src/gui/dialogs/freedv_reporter.cpp
+++ b/src/gui/dialogs/freedv_reporter.cpp
@@ -90,6 +90,11 @@ FreeDVReporterDialog::FreeDVReporterDialog(wxWindow* parent, wxWindowID id, cons
     , filterSelfMessageUpdates_(false)
     , filteredFrequency_(0)
 {
+    if (wxGetApp().customConfigFileName != "")
+    {
+        SetTitle(wxString::Format("%s (%s)", _("FreeDV Reporter"), wxGetApp().customConfigFileName));
+    }
+    
     for (int col = 0; col < NUM_COLS; col++)
     {
         columnLengths_[col] = DefaultColumnWidths_[col];
diff --git a/src/main.cpp b/src/main.cpp
index 56041d30..76ce106a 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -204,6 +204,10 @@ bool MainApp::OnCmdLineParsed(wxCmdLineParser& parser)
         fprintf(stderr, "Loading configuration from %s\n", (const char*)configPath.ToUTF8());
         pConfig = new wxFileConfig(wxT("FreeDV"), wxT("CODEC2-Project"), configPath, configPath, wxCONFIG_USE_LOCAL_FILE);
         wxConfigBase::Set(pConfig);
+        
+        // On Linux/macOS, this replaces $HOME with "~" to shorten the title a bit.
+        wxFileName fn(configPath);        
+        customConfigFileName = fn.GetFullName();
     }
     pConfig->SetRecordDefaults();
     
@@ -240,7 +244,7 @@ bool MainApp::OnInit()
     // displayed. But it doesn't when built from command line.  Why?
 
     frame->m_auiNbookCtrl->ChangeSelection(0);
-    frame->Layout();
+    frame->Layout();    
     frame->Show();
     g_parent =frame;
 
@@ -648,6 +652,12 @@ MainFrame::MainFrame(wxWindow *parent) : TopFrame(parent, wxID_ANY, _("FreeDV ")
     pthread_setname_np(pthread_self(), "FreeDV GUI");
 #endif // defined(__linux__)
 
+    // Add config file name to title bar if provided at the command line.
+    if (wxGetApp().customConfigFileName != "")
+    {
+        SetTitle(wxString::Format("%s (%s)", _("FreeDV ") + _(FREEDV_VERSION), wxGetApp().customConfigFileName));
+    }
+    
     m_reporterDialog = nullptr;
     m_filterDialog = nullptr;
 
diff --git a/src/main.h b/src/main.h
index f49e43a1..006f65a9 100644
--- a/src/main.h
+++ b/src/main.h
@@ -168,6 +168,7 @@ class MainApp : public wxApp
         bool                    CanAccessSerialPort(std::string portName);
         
         FreeDVConfiguration appConfiguration;
+        wxString customConfigFileName;
         
         // PTT -----------------------------------    
         unsigned int        m_intHamlibRig;