diff --git a/azurerm/internal/services/applicationinsights/application_insights_data_source.go b/azurerm/internal/services/applicationinsights/application_insights_data_source.go
index 309853a9742c..363afb4347e3 100644
--- a/azurerm/internal/services/applicationinsights/application_insights_data_source.go
+++ b/azurerm/internal/services/applicationinsights/application_insights_data_source.go
@@ -35,6 +35,12 @@ func dataSourceArmApplicationInsights() *schema.Resource {
 				Computed: true,
 			},
 
+			"connection_string": {
+				Type:      schema.TypeString,
+				Computed:  true,
+				Sensitive: true,
+			},
+
 			"location": {
 				Type:     schema.TypeString,
 				Computed: true,
@@ -85,6 +91,7 @@ func dataSourceArmApplicationInsightsRead(d *schema.ResourceData, meta interface
 
 	d.SetId(*resp.ID)
 	d.Set("instrumentation_key", resp.InstrumentationKey)
+	d.Set("connection_string", resp.ConnectionString)
 	d.Set("location", resp.Location)
 	d.Set("app_id", resp.AppID)
 	d.Set("application_type", resp.ApplicationType)
diff --git a/azurerm/internal/services/applicationinsights/application_insights_resource.go b/azurerm/internal/services/applicationinsights/application_insights_resource.go
index d595590506be..1b0213ae7335 100644
--- a/azurerm/internal/services/applicationinsights/application_insights_resource.go
+++ b/azurerm/internal/services/applicationinsights/application_insights_resource.go
@@ -116,6 +116,12 @@ func resourceArmApplicationInsights() *schema.Resource {
 				Computed:  true,
 				Sensitive: true,
 			},
+
+			"connection_string": {
+				Type:      schema.TypeString,
+				Computed:  true,
+				Sensitive: true,
+			},
 		},
 	}
 }
@@ -252,6 +258,7 @@ func resourceArmApplicationInsightsRead(d *schema.ResourceData, meta interface{}
 		d.Set("instrumentation_key", props.InstrumentationKey)
 		d.Set("sampling_percentage", props.SamplingPercentage)
 		d.Set("disable_ip_masking", props.DisableIPMasking)
+		d.Set("connection_string", props.ConnectionString)
 		if v := props.RetentionInDays; v != nil {
 			d.Set("retention_in_days", v)
 		}
diff --git a/website/docs/d/application_insights.html.markdown b/website/docs/d/application_insights.html.markdown
index e7a72c502e59..ec6a6c9c63c4 100644
--- a/website/docs/d/application_insights.html.markdown
+++ b/website/docs/d/application_insights.html.markdown
@@ -34,6 +34,7 @@ output "application_insights_instrumentation_key" {
 * `app_id` - The App ID associated with this Application Insights component.
 * `application_type` - The type of the component.
 * `instrumentation_key` - The instrumentation key of the Application Insights component.
+* `connection_string` - The connection string of the Application Insights component. (Sensitive)
 * `location` - The Azure location where the component exists.
 * `retention_in_days` - The retention period in days.
 * `tags` - Tags applied to the component.
diff --git a/website/docs/r/application_insights.html.markdown b/website/docs/r/application_insights.html.markdown
index 87903dd273fd..3d6588417438 100644
--- a/website/docs/r/application_insights.html.markdown
+++ b/website/docs/r/application_insights.html.markdown
@@ -70,6 +70,8 @@ The following attributes are exported:
 
 * `instrumentation_key` - The Instrumentation Key for this Application Insights component.
 
+* `connection_string` - The Connection String for this Application Insights component. (Sensitive)
+
 ## Timeouts
 
 The `timeouts` block allows you to specify [timeouts](https://www.terraform.io/docs/configuration/resources.html#timeouts) for certain actions: