diff --git a/sendgrid/helpers/mail/mail.py b/sendgrid/helpers/mail/mail.py
index ba21f789..ba04a2b5 100644
--- a/sendgrid/helpers/mail/mail.py
+++ b/sendgrid/helpers/mail/mail.py
@@ -24,6 +24,7 @@ def __init__(
             self,
             from_email=None,
             to_emails=None,
+            reply_to=None,
             subject=None,
             plain_text_content=None,
             html_content=None,
@@ -40,6 +41,8 @@ def __init__(
         :param to_emails: The email address of the recipient
         :type to_emails: To, str, tuple, list(str), list(tuple),
                          list(To), optional
+        :param reply_to: The email address to reply to
+        :type reply_to: ReplyTo, tuple, optional
         :param plain_text_content: The plain text body of the email
         :type plain_text_content: string, optional
         :param html_content: The html body of the email
@@ -79,6 +82,10 @@ def __init__(
         if html_content is not None:
             self.add_content(html_content, MimeType.html)
 
+        # Optional
+        if reply_to is not None:
+            self.reply_to = reply_to
+
     def __str__(self):
         """A JSON-ready string representation of this Mail object.
 
diff --git a/test/test_mail_helpers.py b/test/test_mail_helpers.py
index 57a4ba88..49c58d05 100644
--- a/test/test_mail_helpers.py
+++ b/test/test_mail_helpers.py
@@ -94,12 +94,13 @@ def test_batch_id(self):
 
     # Send a Single Email to a Single Recipient
     def test_single_email_to_a_single_recipient(self):
-        from sendgrid.helpers.mail import (Mail, From, To, Subject,
+        from sendgrid.helpers.mail import (Mail, From, To, ReplyTo, Subject,
                                            PlainTextContent, HtmlContent)
         self.maxDiff = None
         message = Mail(
             from_email=From('test+from@example.com', 'Example From Name'),
             to_emails=To('test+to@example.com', 'Example To Name'),
+            reply_to=ReplyTo('test+reply_to@example.com', 'Example Reply To Name'),
             subject=Subject('Sending with SendGrid is Fun'),
             plain_text_content=PlainTextContent(
                 'and easy to do anywhere, even with Python'),
@@ -123,6 +124,10 @@ def test_single_email_to_a_single_recipient(self):
                     "email": "test+from@example.com",
                     "name": "Example From Name"
                 },
+                "reply_to": {
+                    "email": "test+reply_to@example.com",
+                    "name": "Example Reply To Name"
+                },
                 "personalizations": [
                     {
                         "to": [
diff --git a/use_cases/send_a_single_email_to_a_single_recipient.md b/use_cases/send_a_single_email_to_a_single_recipient.md
index 8a236428..c469c3bd 100644
--- a/use_cases/send_a_single_email_to_a_single_recipient.md
+++ b/use_cases/send_a_single_email_to_a_single_recipient.md
@@ -6,6 +6,7 @@ from sendgrid.helpers.mail import Mail
 message = Mail(
     from_email='from_email@example.com',
     to_emails='to@example.com',
+    reply_to='reply_to@example.com',
     subject='Sending with Twilio SendGrid is Fun',
     html_content='<strong>and easy to do anywhere, even with Python</strong>')
 try: