diff --git a/lib/faraday/error.rb b/lib/faraday/error.rb
index 32354b3e..6f2c33a9 100644
--- a/lib/faraday/error.rb
+++ b/lib/faraday/error.rb
@@ -112,6 +112,10 @@ module Faraday
   class ProxyAuthError < ClientError
   end
 
+  # Raised by Faraday::Response::RaiseError in case of a 408 response.
+  class RequestTimeoutError < ClientError
+  end
+
   # Raised by Faraday::Response::RaiseError in case of a 409 response.
   class ConflictError < ClientError
   end
diff --git a/lib/faraday/response/raise_error.rb b/lib/faraday/response/raise_error.rb
index e72cd40e..9383d39d 100644
--- a/lib/faraday/response/raise_error.rb
+++ b/lib/faraday/response/raise_error.rb
@@ -24,6 +24,8 @@ module Faraday
           # mimic the behavior that we get with proxy requests with HTTPS
           msg = %(407 "Proxy Authentication Required")
           raise Faraday::ProxyAuthError.new(msg, response_values(env))
+        when 408
+          raise Faraday::RequestTimeoutError, response_values(env)
         when 409
           raise Faraday::ConflictError, response_values(env)
         when 422
diff --git a/spec/faraday/response/raise_error_spec.rb b/spec/faraday/response/raise_error_spec.rb
index 95b8676f..2a468451 100644
--- a/spec/faraday/response/raise_error_spec.rb
+++ b/spec/faraday/response/raise_error_spec.rb
@@ -11,6 +11,7 @@ RSpec.describe Faraday::Response::RaiseError do
         stub.get('forbidden') { [403, { 'X-Reason' => 'because' }, 'keep looking'] }
         stub.get('not-found') { [404, { 'X-Reason' => 'because' }, 'keep looking'] }
         stub.get('proxy-error') { [407, { 'X-Reason' => 'because' }, 'keep looking'] }
+        stub.get('request-timeout') { [408, { 'X-Reason' => 'because' }, 'keep looking'] }
         stub.get('conflict') { [409, { 'X-Reason' => 'because' }, 'keep looking'] }
         stub.get('unprocessable-entity') { [422, { 'X-Reason' => 'because' }, 'keep looking'] }
         stub.get('4xx') { [499, { 'X-Reason' => 'because' }, 'keep looking'] }
@@ -79,6 +80,17 @@ RSpec.describe Faraday::Response::RaiseError do
     end
   end
 
+  it 'raises Faraday::RequestTimeoutError for 408 responses' do
+    expect { conn.get('request-timeout') }.to raise_error(Faraday::RequestTimeoutError) do |ex|
+      expect(ex.message).to eq('the server responded with status 408')
+      expect(ex.response[:headers]['X-Reason']).to eq('because')
+      expect(ex.response[:status]).to eq(408)
+      expect(ex.response_status).to eq(408)
+      expect(ex.response_body).to eq('keep looking')
+      expect(ex.response_headers['X-Reason']).to eq('because')
+    end
+  end
+
   it 'raises Faraday::ConflictError for 409 responses' do
     expect { conn.get('conflict') }.to raise_error(Faraday::ConflictError) do |ex|
       expect(ex.message).to eq('the server responded with status 409')