diff --git a/config.yml.default b/config.yml.default
index cac46f9e0..47c03f284 100644
--- a/config.yml.default
+++ b/config.yml.default
@@ -163,6 +163,8 @@ challenge:                         # Incoming challenges.
 # block_list:                      # List of users from which the challenges are always declined.
 #   - user1
 #   - user2
+# online_block_list:               # The urls from which to retrieve a list of bot names that will not be challenged. The list should be a text file where each line contains the name of a blocked bot
+#   - example.com/blocklist
 # allow_list:                      # List of users from which challenges are exclusively accepted, all others being declined. If empty, challenges from all users may be accepted.
 #   - user3
 #   - user4
@@ -211,6 +213,8 @@ matchmaking:
 # block_list:                      # The list of bots that will not be challenged
 #   - user1
 #   - user2
+# online_block_list:               # The urls from which to retrieve a list of bot names that will not be challenged. The list should be a text file where each line contains the name of a blocked bot
+#   - example.com/blocklist
   include_challenge_block_list: false  # Do not challenge bots in the challenge: block_list in addition to the matchmaking block list.
 
 # overrides:                       # List of overrides for the matchmaking specifications above. When a challenge is created, either the default specification above or one of the overrides will be randomly chosen.
diff --git a/lib/config.py b/lib/config.py
index ba0f65894..e0646fc3f 100644
--- a/lib/config.py
+++ b/lib/config.py
@@ -4,6 +4,7 @@
 import os
 import logging
 import math
+import requests
 from abc import ABCMeta
 from typing import Any, Union, ItemsView, Callable
 from lib.lichess_types import CONFIG_DICT_TYPE, FilterType
@@ -209,6 +210,7 @@ def insert_default_values(CONFIG: CONFIG_DICT_TYPE) -> None:
     set_config_default(CONFIG, "challenge", key="max_days", default=math.inf)
     set_config_default(CONFIG, "challenge", key="min_days", default=1)
     set_config_default(CONFIG, "challenge", key="block_list", default=[], force_empty_values=True)
+    set_config_default(CONFIG, "challenge", key="online_block_list", default=[], force_empty_values=True)
     set_config_default(CONFIG, "challenge", key="allow_list", default=[], force_empty_values=True)
     set_config_default(CONFIG, "challenge", key="max_simultaneous_games_per_user", default=5)
     set_config_default(CONFIG, "correspondence", key="checkin_period", default=600)
@@ -217,6 +219,7 @@ def insert_default_values(CONFIG: CONFIG_DICT_TYPE) -> None:
     set_config_default(CONFIG, "matchmaking", key="challenge_timeout", default=30, force_empty_values=True)
     CONFIG["matchmaking"]["challenge_timeout"] = max(CONFIG["matchmaking"]["challenge_timeout"], 1)
     set_config_default(CONFIG, "matchmaking", key="block_list", default=[], force_empty_values=True)
+    set_config_default(CONFIG, "matchmaking", key="online_block_list", default=[], force_empty_values=True)
     set_config_default(CONFIG, "matchmaking", key="include_challenge_block_list", default=False, force_empty_values=True)
     default_filter = (CONFIG.get("matchmaking") or {}).get("delay_after_decline") or FilterType.NONE.value
     set_config_default(CONFIG, "matchmaking", key="challenge_filter", default=default_filter, force_empty_values=True)
@@ -248,6 +251,23 @@ def insert_default_values(CONFIG: CONFIG_DICT_TYPE) -> None:
         for target in ["", "_spectators"]:
             set_config_default(CONFIG, "greeting", key=greeting + target, default="", force_empty_values=True)
 
+
+def process_block_list(CONFIG: CONFIG_DICT_TYPE) -> None:
+    """
+    Retrieve online block lists and copy over challenge blocklist if necessary.
+
+    :param CONFIG: The bot's config.
+    """
+    def parse_block_list_from_url(url: str) -> list[str]:
+        block_list = requests.get(url).text.strip()
+        return [username.strip() for username in block_list.split("\n")]
+
+    for url in CONFIG["matchmaking"]["online_block_list"]:
+        CONFIG["matchmaking"]["block_list"].extend(parse_block_list_from_url(url))
+
+    for url in CONFIG["challenge"]["online_block_list"]:
+        CONFIG["challenge"]["block_list"].extend(parse_block_list_from_url(url))
+
     if CONFIG["matchmaking"]["include_challenge_block_list"]:
         CONFIG["matchmaking"]["block_list"].extend(CONFIG["challenge"]["block_list"])
 
@@ -408,6 +428,7 @@ def load_config(config_file: str) -> Configuration:
         CONFIG["token"] = os.environ["LICHESS_BOT_TOKEN"]
 
     insert_default_values(CONFIG)
+    process_block_list(CONFIG)
     log_config(CONFIG)
     validate_config(CONFIG)
 
diff --git a/test_bot/buggy_engine_macos b/test_bot/buggy_engine_macos
old mode 100644
new mode 100755
diff --git a/wiki/Configure-lichess-bot.md b/wiki/Configure-lichess-bot.md
index aa32db359..24b75cde9 100644
--- a/wiki/Configure-lichess-bot.md
+++ b/wiki/Configure-lichess-bot.md
@@ -192,6 +192,7 @@ will precede the `go` command to start thinking with `sd 5`. The other `go_comma
     -casual
 ```
   - `block_list`: An indented list of usernames from which the challenges are always declined. If this option is not present, then the list is considered empty.
+  - `online_block_list`: An indented list of urls from which additional block lists are retrieved. An online block list is a plain text file where each line contains a single username. If this option is not present, then the list is considered empty.
   - `allow_list`: An indented list of usernames from which challenges are exclusively accepted. A challenge from a user not on this list is declined. If this option is not present or empty, any user's challenge may be accepted.
   - `recent_bot_challenge_age`: Maximum age of a bot challenge to be considered recent in seconds
   - `max_recent_bot_challenges`: Maximum number of recent challenges that can be accepted from the same bot
@@ -255,6 +256,7 @@ will precede the `go` command to start thinking with `sd 5`. The other `go_comma
 
     The `challenge_filter` option can be useful if your matchmaking settings result in a lot of declined challenges. The bots that accept challenges will be challenged more often than those that have declined. The filter will remain until lichess-bot quits or the connection with lichess.org is reset.
   - `block_list`: An indented list of usernames of bots that will not be challenged. If this option is not present, then the list is considered empty.
+  - `online_block_list`: An indented list of urls from which additional block lists are retrieved. An online block list is a plain text file where each line contains a single username. If this option is not present, then the list is considered empty.
   - `include_challenge_block_list`: If `true`, do not send challenges to the bots listed in the `challenge: block_list`. Default is `false`.
   - `overrides`: Create variations on the matchmaking settings above for more specific circumstances. If there are any subsections under `overrides`, the settings below that will override the settings in the matchmaking section. Any settings that do not appear will be taken from the settings above. <br/> <br/>
   The overrides section must have the following: