diff --git a/app/models/activity.rb b/app/models/activity.rb
index 76f865d0e..e9754e67b 100644
--- a/app/models/activity.rb
+++ b/app/models/activity.rb
@@ -24,6 +24,10 @@ def after_audit
     index_name "activities"
   end
 
+  settings index: {
+    number_of_shards: ENV["NUMBER_OF_SHARDS_ACTIVITY"].to_i,
+  }
+
   mapping dynamic: "false" do
     indexes :id, type: :keyword
     indexes :auditable_id, type: :keyword
diff --git a/app/models/concerns/indexable.rb b/app/models/concerns/indexable.rb
index 5a9c94603..6fae2ad18 100644
--- a/app/models/concerns/indexable.rb
+++ b/app/models/concerns/indexable.rb
@@ -1202,7 +1202,7 @@ def create_template
         elsif name == "OtherDoi"
           {
             index_patterns: ["#{alias_name}*"],
-            settings: Doi.settings.to_hash,
+            settings: settings.to_hash,
             mappings: Doi.mappings.to_hash,
           }
         else
diff --git a/app/models/event.rb b/app/models/event.rb
index 0fe9044fe..8f3c4fff8 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -148,6 +148,10 @@ class Event < ApplicationRecord
     index_name "events"
   end
 
+  settings index: {
+    number_of_shards: ENV["NUMBER_OF_SHARDS_EVENT"].to_i,
+  }
+
   mapping dynamic: "false" do
     indexes :uuid, type: :keyword
     indexes :subj_id, type: :keyword
diff --git a/app/models/other_doi.rb b/app/models/other_doi.rb
index 113491634..168817a18 100644
--- a/app/models/other_doi.rb
+++ b/app/models/other_doi.rb
@@ -12,6 +12,10 @@ class OtherDoi < Doi
     index_name "dois-other"
   end
 
+  settings index: Doi.settings.to_hash.fetch(:index, {}).merge(
+    number_of_shards: ENV["NUMBER_OF_SHARDS_OTHER_DOI"].to_i,
+  )
+
   def client_id=(_value)
     write_attribute(:datacentre, 0)
   end
diff --git a/config/application.rb b/config/application.rb
index 1f4b417e3..a4d84a377 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -60,6 +60,9 @@
 ENV["ES_PORT"] ||= "80"
 ENV["ES_PREFIX"] ||= ""
 ENV["NUMBER_OF_SHARDS_DATACITE_DOI"] ||= "5"
+ENV["NUMBER_OF_SHARDS_OTHER_DOI"] ||= "5"
+ENV["NUMBER_OF_SHARDS_EVENT"] ||= "5"
+ENV["NUMBER_OF_SHARDS_ACTIVITY"] ||= "5"
 ENV["TRUSTED_IP"] ||= "10.0.40.1"
 ENV["MG_FROM"] ||= "support@datacite.org"
 ENV["MG_DOMAIN"] ||= "mg.datacite.org"
diff --git a/spec/models/activity_shard_settings_spec.rb b/spec/models/activity_shard_settings_spec.rb
new file mode 100644
index 000000000..90b56de8a
--- /dev/null
+++ b/spec/models/activity_shard_settings_spec.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe "Activity number_of_shards" do
+  it "defaults to 5 on Activity settings" do
+    expect(ENV.fetch("NUMBER_OF_SHARDS_ACTIVITY")).to eq("5")
+    expect(Activity.settings.to_hash.dig(:index, :number_of_shards)).to eq(5)
+  end
+
+  it "does not apply the Activity shard setting to shared Doi settings" do
+    expect(Doi.settings.to_hash.dig(:index, :number_of_shards)).to be_nil
+    expect(Activity.settings).not_to equal(Event.settings)
+    expect(Activity.settings).not_to equal(Doi.settings)
+    expect(Activity.mappings.to_hash[:properties]).to be_present
+  end
+
+  it "uses Activity.settings when building the Activity template" do
+    indices = Elasticsearch::Model.client.indices
+    allow(indices).to receive(:exists_template?).and_return(false)
+    expect(indices).to receive(:put_template) do |args|
+      expect(args[:name]).to eq(Activity.index_name)
+      expect(args[:body][:index_patterns]).to eq(["#{Activity.index_name}*"])
+      expect(args[:body][:settings]).to eq(Activity.settings.to_hash)
+      expect(args[:body][:settings][:index][:number_of_shards]).to eq(5)
+      expect(args[:body][:mappings]).to eq(Activity.mappings.to_hash)
+      { "acknowledged" => true }
+    end
+
+    Activity.create_template
+  end
+end
diff --git a/spec/models/datacite_doi_shard_settings_spec.rb b/spec/models/datacite_doi_shard_settings_spec.rb
index fd21f9568..886a31007 100644
--- a/spec/models/datacite_doi_shard_settings_spec.rb
+++ b/spec/models/datacite_doi_shard_settings_spec.rb
@@ -8,9 +8,9 @@
     expect(DataciteDoi.settings.to_hash.dig(:index, :number_of_shards)).to eq(5)
   end
 
-  it "does not apply the shard setting to OtherDoi or shared Doi settings" do
+  it "does not apply the Datacite shard setting to shared Doi settings" do
     expect(Doi.settings.to_hash.dig(:index, :number_of_shards)).to be_nil
-    expect(OtherDoi.settings.to_hash.dig(:index, :number_of_shards)).to be_nil
+    expect(DataciteDoi.settings).not_to equal(Doi.settings)
   end
 
   it "uses DataciteDoi.settings when building the Datacite template" do
@@ -29,14 +29,17 @@
     DataciteDoi.create_template
   end
 
-  it "keeps OtherDoi templates free of the Datacite shard setting" do
+  it "keeps OtherDoi templates on OtherDoi settings, not shared Doi settings" do
     indices = Elasticsearch::Model.client.indices
     allow(indices).to receive(:exists_template?).and_return(false)
     expect(indices).to receive(:put_template) do |args|
       expect(args[:name]).to eq(OtherDoi.index_name)
       expect(args[:body][:index_patterns]).to eq(["#{OtherDoi.index_name}*"])
-      expect(args[:body][:settings]).to eq(Doi.settings.to_hash)
-      expect(args[:body][:settings].dig(:index, :number_of_shards)).to be_nil
+      expect(args[:body][:settings]).to eq(OtherDoi.settings.to_hash)
+      expect(args[:body][:settings][:index][:number_of_shards]).to eq(
+        ENV.fetch("NUMBER_OF_SHARDS_OTHER_DOI").to_i,
+      )
+      expect(Doi.settings.to_hash.dig(:index, :number_of_shards)).to be_nil
       { "acknowledged" => true }
     end
 
diff --git a/spec/models/event_shard_settings_spec.rb b/spec/models/event_shard_settings_spec.rb
new file mode 100644
index 000000000..a0e540168
--- /dev/null
+++ b/spec/models/event_shard_settings_spec.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe "Event number_of_shards" do
+  it "defaults to 5 on Event settings" do
+    expect(ENV.fetch("NUMBER_OF_SHARDS_EVENT")).to eq("5")
+    expect(Event.settings.to_hash.dig(:index, :number_of_shards)).to eq(5)
+  end
+
+  it "does not apply the Event shard setting to shared Doi settings" do
+    expect(Doi.settings.to_hash.dig(:index, :number_of_shards)).to be_nil
+    expect(Event.settings).not_to equal(Activity.settings)
+    expect(Event.settings).not_to equal(Doi.settings)
+    expect(Event.mappings.to_hash[:properties]).to be_present
+  end
+
+  it "uses Event.settings when building the Event template" do
+    indices = Elasticsearch::Model.client.indices
+    allow(indices).to receive(:exists_template?).and_return(false)
+    expect(indices).to receive(:put_template) do |args|
+      expect(args[:name]).to eq(Event.index_name)
+      expect(args[:body][:index_patterns]).to eq(["#{Event.index_name}*"])
+      expect(args[:body][:settings]).to eq(Event.settings.to_hash)
+      expect(args[:body][:settings][:index][:number_of_shards]).to eq(5)
+      expect(args[:body][:mappings]).to eq(Event.mappings.to_hash)
+      { "acknowledged" => true }
+    end
+
+    Event.create_template
+  end
+end
diff --git a/spec/models/other_doi_shard_settings_spec.rb b/spec/models/other_doi_shard_settings_spec.rb
new file mode 100644
index 000000000..67b452047
--- /dev/null
+++ b/spec/models/other_doi_shard_settings_spec.rb
@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe "Other DOI number_of_shards" do
+  it "defaults to 5 on OtherDoi settings" do
+    expect(ENV.fetch("NUMBER_OF_SHARDS_OTHER_DOI")).to eq("5")
+    expect(OtherDoi.settings.to_hash.dig(:index, :number_of_shards)).to eq(5)
+  end
+
+  it "does not apply the OtherDoi shard setting to shared Doi settings" do
+    expect(Doi.settings.to_hash.dig(:index, :number_of_shards)).to be_nil
+    expect(OtherDoi.settings).not_to equal(Doi.settings)
+    expect(OtherDoi.settings).not_to equal(DataciteDoi.settings)
+  end
+
+  it "uses OtherDoi.settings when building the OtherDoi template" do
+    indices = Elasticsearch::Model.client.indices
+    allow(indices).to receive(:exists_template?).and_return(false)
+    expect(indices).to receive(:put_template) do |args|
+      expect(args[:name]).to eq(OtherDoi.index_name)
+      expect(args[:body][:index_patterns]).to eq(["#{OtherDoi.index_name}*"])
+      expect(args[:body][:settings]).to eq(OtherDoi.settings.to_hash)
+      expect(args[:body][:settings][:index][:number_of_shards]).to eq(5)
+      expect(args[:body][:mappings]).to eq(Doi.mappings.to_hash)
+      { "acknowledged" => true }
+    end
+
+    OtherDoi.create_template
+  end
+
+  it "keeps DataciteDoi templates on DataciteDoi settings" do
+    indices = Elasticsearch::Model.client.indices
+    allow(indices).to receive(:exists_template?).and_return(false)
+    expect(indices).to receive(:put_template) do |args|
+      expect(args[:name]).to eq(DataciteDoi.index_name)
+      expect(args[:body][:index_patterns]).to eq(
+        [DataciteDoi.index_name, "#{DataciteDoi.index_name}_v1", "#{DataciteDoi.index_name}_v2"],
+      )
+      expect(args[:body][:settings]).to eq(DataciteDoi.settings.to_hash)
+      expect(args[:body][:settings][:index][:number_of_shards]).to eq(
+        ENV.fetch("NUMBER_OF_SHARDS_DATACITE_DOI").to_i,
+      )
+      { "acknowledged" => true }
+    end
+
+    DataciteDoi.create_template
+  end
+end