diff --git a/app/models/abuse_report.rb b/app/models/abuse_report.rb
index be54549c63..90faf32524 100644
--- a/app/models/abuse_report.rb
+++ b/app/models/abuse_report.rb
@@ -53,14 +53,15 @@ def akismet_attributes
 
   scope :by_date, -> { order('created_at DESC') }
 
-  # Standardize the format of work, chapter, and profile URLs to get it ready
-  # for the url_is_not_over_reported validation.
+  # Standardize the format of work, chapter, comment, and profile URLs
+  # to get it ready for the url_is_not_over_reported validation.
   # Work URLs: "works/123"
   # Chapter URLs: "chapters/123"
+  # Comment URLs: "comments/123"
   # Profile URLs: "users/username"
   before_validation :standardize_url, on: :create
   def standardize_url
-    return unless url =~ %r{((chapters|works)/\d+)} || url =~ %r{(users\/\w+)}
+    return unless url =~ %r{((chapters|works|comments)/\d+)} || url =~ %r{(users/\w+)}
 
     self.url = add_scheme_to_url(url)
     self.url = clean_url(url)
@@ -208,35 +209,36 @@ def attach_work_download(ticket_id)
     ReportAttachmentJob.perform_later(ticket_id, work) if work
   end
 
-  # if the URL clearly belongs to a work (i.e. contains "/works/123")
-  # or a user profile (i.e. contains "/users/username")
-  # make sure it isn't reported more than ABUSE_REPORTS_PER_WORK_MAX
-  # or ABUSE_REPORTS_PER_USER_MAX times per month
+  # if the URL clearly belongs to a specific piece of content
+  # make sure it isn't reported more than ABUSE_REPORTS_PER_<type>_MAX
+  # times within the configured time period
   def url_is_not_over_reported
-    message = ts('This page has already been reported. Our volunteers only
-                 need one report in order to investigate and resolve an issue,
-                 so please be patient and do not submit another report.')
-    if url =~ /\/works\/\d+/
+    case url
+    when %r{/comments/\d+}
+      comment_params_only = url.match(%r{/comments/\d+/}).to_s
+      comment_report_period = ArchiveConfig.ABUSE_REPORTS_PER_COMMENT_PERIOD.days.ago
+      existing_reports_total = AbuseReport.where('created_at > ? AND
+                                                 url LIKE ?',
+                                                 comment_report_period,
+                                                 "%#{comment_params_only}%").count
+      errors.add(:base, :over_reported_comment) if existing_reports_total >= ArchiveConfig.ABUSE_REPORTS_PER_COMMENT_MAX
+    when %r{/works/\d+}
       # use "/works/123/" to avoid matching chapter or external work ids
-      work_params_only = url.match(/\/works\/\d+\//).to_s
+      work_params_only = url.match(%r{/works/\d+/}).to_s
       work_report_period = ArchiveConfig.ABUSE_REPORTS_PER_WORK_PERIOD.days.ago
       existing_reports_total = AbuseReport.where('created_at > ? AND
                                                  url LIKE ?',
                                                  work_report_period,
                                                  "%#{work_params_only}%").count
-      if existing_reports_total >= ArchiveConfig.ABUSE_REPORTS_PER_WORK_MAX
-        errors.add(:base, message)
-      end
-    elsif url =~ /\/users\/\w+/
-      user_params_only = url.match(/\/users\/\w+\//).to_s
+      errors.add(:base, :over_reported) if existing_reports_total >= ArchiveConfig.ABUSE_REPORTS_PER_WORK_MAX
+    when %r{/users/\w+}
+      user_params_only = url.match(%r{/users/\w+/}).to_s
       user_report_period = ArchiveConfig.ABUSE_REPORTS_PER_USER_PERIOD.days.ago
       existing_reports_total = AbuseReport.where('created_at > ? AND
                                                  url LIKE ?',
                                                  user_report_period,
                                                  "%#{user_params_only}%").count
-      if existing_reports_total >= ArchiveConfig.ABUSE_REPORTS_PER_USER_MAX
-        errors.add(:base, message)
-      end
+      errors.add(:base, :over_reported) if existing_reports_total >= ArchiveConfig.ABUSE_REPORTS_PER_USER_MAX
     end
   end
 
diff --git a/config/config.yml b/config/config.yml
index 2c04187451..f44c877682 100644
--- a/config/config.yml
+++ b/config/config.yml
@@ -173,6 +173,10 @@ ABUSE_REPORTS_PER_USER_PERIOD: 31
 ABUSE_REPORTS_PER_WORK_MAX: 5
 # time period, in days, used to total number of reports for a given work URL
 ABUSE_REPORTS_PER_WORK_PERIOD: 31
+# max number of abuse reports to accept for a given comment URL
+ABUSE_REPORTS_PER_COMMENT_MAX: 3
+# time period, in days, used to total number of reports for a given comment URL
+ABUSE_REPORTS_PER_COMMENT_PERIOD: 30
 # max number of abuse reports to accept from a given email
 ABUSE_REPORTS_PER_EMAIL_MAX: 5
 
diff --git a/config/locales/models/en.yml b/config/locales/models/en.yml
index 834f877264..e6f87c57e5 100644
--- a/config/locales/models/en.yml
+++ b/config/locales/models/en.yml
@@ -86,6 +86,9 @@ en:
       models:
         abuse_report:
           attributes:
+            base:
+              over_reported: This page has already been reported. Our volunteers only need one report in order to investigate and resolve an issue, so please be patient and do not submit another report.
+              over_reported_comment: This comment has already been reported. Our volunteers only need one report in order to investigate and resolve an issue, so please be patient and do not submit another report.
             url:
               not_on_archive: does not appear to be on this site.
         admin_post:
diff --git a/spec/models/abuse_report_spec.rb b/spec/models/abuse_report_spec.rb
index 79db070062..a029a4e938 100644
--- a/spec/models/abuse_report_spec.rb
+++ b/spec/models/abuse_report_spec.rb
@@ -145,6 +145,14 @@
       end
     end
 
+    shared_examples "enough comment reports" do |url|
+      let(:report) { build(:abuse_report, url: url) }
+      it "can't be submitted" do
+        expect(report.save).to be_falsey
+        expect(report.errors[:base].first).to include("This comment has already been reported.")
+      end
+    end
+
     shared_examples "alright" do |url|
       let(:report) { build(:abuse_report, url: url) }
       it "can be submitted" do
@@ -195,6 +203,9 @@
       it_behaves_like "enough already", "http://archiveofourown.org/works/789/chapters/123?ending=1"
       it_behaves_like "enough already", "http://archiveofourown.org/works/789/chapters/123?ending=2#major-character-death"
 
+      # a comment on the work
+      it_behaves_like "alright", "http://archiveofourown.org/works/789/comments/876"
+
       # the same work: variations we don't cover
       it_behaves_like "alright", "http://archiveofourown.org/chapters/123"
       it_behaves_like "alright", "http://archiveofourown.org/comments/show_comments?work_id=789"
@@ -215,6 +226,59 @@
       end
     end
 
+    context "for a comment reported the maximum number of times" do
+      comment_url = "http://archiveofourown.org/comments/876"
+
+      before do
+        ArchiveConfig.ABUSE_REPORTS_PER_COMMENT_MAX.times do
+          create(:abuse_report, url: comment_url)
+        end
+        expect(AbuseReport.count).to eq(ArchiveConfig.ABUSE_REPORTS_PER_COMMENT_MAX)
+      end
+
+      # obviously
+      it_behaves_like "enough comment reports", comment_url
+
+      # the same comment, different protocol
+      it_behaves_like "enough comment reports", "https://archiveofourown.org/comments/876"
+
+      # the same comment, with parameters/anchors
+      it_behaves_like "enough comment reports", "http://archiveofourown.org/comments/876?smut=yes"
+      it_behaves_like "enough comment reports", "http://archiveofourown.org/comments/876#timeline"
+      it_behaves_like "enough comment reports", "http://archiveofourown.org/comments/876?smut=yes#timeline"
+      it_behaves_like "enough comment reports", "http://archiveofourown.org/comments/876/?smut=yes"
+      it_behaves_like "enough comment reports", "http://archiveofourown.org/comments/876/#timeline"
+      it_behaves_like "enough comment reports", "http://archiveofourown.org/comments/876/?smut=yes#timeline"
+
+      # the same comment, under users
+      it_behaves_like "enough comment reports", "http://archiveofourown.org/users/author/comments/876"
+
+      # the same comment, under works
+      it_behaves_like "enough comment reports", "http://archiveofourown.org/works/789/comments/876"
+      it_behaves_like "enough comment reports", "http://archiveofourown.org/works/789/chapters/123/comments/876"
+
+      # the same comment, under chapters
+      it_behaves_like "enough comment reports", "http://archiveofourown.org/chapters/123/comments/876"
+
+      # the same comment: variations we don't cover
+      it_behaves_like "alright", "https://archiveofourown.org/comments/add_comment_reply?chapter_id=123&id=876"
+
+      # not the same comment
+      it_behaves_like "alright", "http://archiveofourown.org/comments/9009"
+      it_behaves_like "alright", "http://archiveofourown.org/comments/87"
+
+      # unrelated
+      it_behaves_like "alright", "http://archiveofourown.org/works/876"
+      it_behaves_like "alright", "http://archiveofourown.org/works/876/comments"
+      it_behaves_like "alright", "http://archiveofourown.org/users/someone"
+
+      context "after the over-reporting period" do
+        before { travel(ArchiveConfig.ABUSE_REPORTS_PER_COMMENT_PERIOD.days) }
+
+        it_behaves_like "alright", comment_url
+      end
+    end
+
     context "when reporting work URLs that cross the reporting period timeframe" do
       work_url = "http://archiveofourown.org/works/790"