diff --git a/CHANGELOG.md b/CHANGELOG.md
index a715581c..f8dda93f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,7 @@
 ### v0.6.x
 - add: Tutorial for saving live timeseries data (e.g., forecast) in context broker and timeseries database ([#336](https://github.com/RWTH-EBC/FiLiP/pull/363))
 - add: Tutorial for using session object ([#370](https://github.com/RWTH-EBC/FiLiP/pull/370))
-
+- fix: Addition of trailing slash if missing from base url ([#371](https://github.com/RWTH-EBC/FiLiP/pull/371))
 
 ### v0.6.0
 - add: Tutorial for connecting with secured endpoints ([#319](https://github.com/RWTH-EBC/FiLiP/pull/319))
diff --git a/filip/clients/base_http_client.py b/filip/clients/base_http_client.py
index f83acee0..44c229ea 100644
--- a/filip/clients/base_http_client.py
+++ b/filip/clients/base_http_client.py
@@ -16,8 +16,8 @@ class NgsiURLVersion(str, Enum):
     URL part that defines the NGSI version for the API.
     """
 
-    v2_url = "/v2"
-    ld_url = "/ngsi-ld/v1"
+    v2_url = "v2"
+    ld_url = "ngsi-ld/v1"
 
 
 class BaseHttpClient:
diff --git a/filip/utils/validators.py b/filip/utils/validators.py
index c17c5e7c..f3ba6de3 100644
--- a/filip/utils/validators.py
+++ b/filip/utils/validators.py
@@ -50,7 +50,11 @@ def validate_http_url(url: AnyHttpUrl) -> str:
     Returns:
         validated url
     """
-    return str(url) if url else url
+    url = str(url) if url else url
+    if url[-1] != "/":
+        # add trailing slash
+        url = f"{url}/"
+    return url
 
 
 @validate_call
diff --git a/tests/clients/test_ngsi_ld_cb.py b/tests/clients/test_ngsi_ld_cb.py
index f6bc3341..f5dee28a 100644
--- a/tests/clients/test_ngsi_ld_cb.py
+++ b/tests/clients/test_ngsi_ld_cb.py
@@ -4,10 +4,15 @@
 
 import unittest
 import logging
+from urllib.parse import urljoin
+
 import pyld
+from pydantic import AnyHttpUrl
 from requests import RequestException, Session
 from requests.adapters import HTTPAdapter
 from urllib3.util.retry import Retry
+
+from filip.clients.base_http_client import NgsiURLVersion, BaseHttpClient
 from filip.clients.ngsi_ld.cb import ContextBrokerLDClient
 from filip.models.base import FiwareLDHeader, core_context
 from filip.models.ngsi_ld.context import (
@@ -95,6 +100,26 @@ def test_not_existing_tenant(self):
         entities = client.get_entity_list()
         self.assertEqual(len(entities), 0)
 
+    def test_url_composition_ld(self):
+        """
+        Test URL composition for ngsi-ld context broker client
+        """
+        user_input_urls = {
+            "http://example.org/orion/": "http://example.org/orion/ngsi-ld/v1/entities",
+            "http://example.org/orion": "http://example.org/orion/ngsi-ld/v1/entities",
+            "http://123.0.0.0:1026": "http://123.0.0.0:1026/ngsi-ld/v1/entities",
+            "http://123.0.0.0:1026/": "http://123.0.0.0:1026/ngsi-ld/v1/entities",
+            "http://123.0.0.0/orion": "http://123.0.0.0/orion/ngsi-ld/v1/entities",
+            "http://123.0.0.0/orion/": "http://123.0.0.0/orion/ngsi-ld/v1/entities",
+        }
+        for url in user_input_urls:
+            url_correct = AnyHttpUrl(user_input_urls[url])
+            bhc = BaseHttpClient(url=url)
+            url_filip = AnyHttpUrl(
+                urljoin(bhc.base_url, f"{NgsiURLVersion.ld_url.value}/entities")
+            )
+            self.assertEqual(url_correct, url_filip)
+
     def test_get_entities_pagination(self):
         """
         Test pagination of get entities
diff --git a/tests/clients/test_ngsi_v2_cb.py b/tests/clients/test_ngsi_v2_cb.py
index d967ae85..dad2cfdb 100644
--- a/tests/clients/test_ngsi_v2_cb.py
+++ b/tests/clients/test_ngsi_v2_cb.py
@@ -12,9 +12,11 @@
 
 import paho.mqtt.client as mqtt
 from datetime import datetime, timedelta
-from urllib.parse import urlparse
+from urllib.parse import urlparse, urljoin
 import requests
 from requests import RequestException
+from pydantic import AnyHttpUrl
+from filip.clients.base_http_client import NgsiURLVersion, BaseHttpClient
 from filip.models.base import FiwareHeader
 from filip.utils.simple_ql import QueryString
 from filip.clients.ngsi_v2 import ContextBrokerClient, IoTAClient
@@ -104,6 +106,26 @@ def setUp(self) -> None:
             }
         )
 
+    def test_url_composition(self):
+        """
+        Test URL composition for context broker client
+        """
+        user_input_urls = {
+            "http://example.org/orion/": "http://example.org/orion/v2/entities",
+            "http://example.org/orion": "http://example.org/orion/v2/entities",
+            "http://123.0.0.0:1026": "http://123.0.0.0:1026/v2/entities",
+            "http://123.0.0.0:1026/": "http://123.0.0.0:1026/v2/entities",
+            "http://123.0.0.0/orion": "http://123.0.0.0/orion/v2/entities",
+            "http://123.0.0.0/orion/": "http://123.0.0.0/orion/v2/entities",
+        }
+        for url in user_input_urls:
+            url_correct = AnyHttpUrl(user_input_urls[url])
+            bhc = BaseHttpClient(url=url)
+            url_filip = AnyHttpUrl(
+                urljoin(bhc.base_url, f"{NgsiURLVersion.v2_url.value}/entities")
+            )
+            self.assertEqual(url_correct, url_filip)
+
     def test_management_endpoints(self):
         """
         Test management functions of context broker client