diff --git a/changelog/10589.feature.rst b/changelog/10589.feature.rst
new file mode 100644
index 000000000..b4828f1e0
--- /dev/null
+++ b/changelog/10589.feature.rst
@@ -0,0 +1,2 @@
+Allow users to override repr maxsize value (240) by defining
+:envvar:`PYTEST_DEFAULT_REPR_MAX_SIZE` environment variable.
diff --git a/doc/en/reference/reference.rst b/doc/en/reference/reference.rst
index 7c7b99d81..3a00c0264 100644
--- a/doc/en/reference/reference.rst
+++ b/doc/en/reference/reference.rst
@@ -1145,6 +1145,11 @@ processes can inspect it, see :ref:`pytest current test env` for more informatio
 
 When set, pytest will print tracing and debug information.
 
+.. envvar:: PYTEST_DEFAULT_REPR_MAX_SIZE
+
+Setting this would override the implicit 240 chars limit used for truncating
+longer error messages.
+
 .. envvar:: PYTEST_DISABLE_PLUGIN_AUTOLOAD
 
 When set, disables plugin auto-loading through :std:doc:`entry point packaging
diff --git a/src/_pytest/_io/saferepr.py b/src/_pytest/_io/saferepr.py
index 9f33fced6..c2560a1e8 100644
--- a/src/_pytest/_io/saferepr.py
+++ b/src/_pytest/_io/saferepr.py
@@ -1,3 +1,4 @@
+import os
 import pprint
 import reprlib
 from typing import Optional
@@ -93,7 +94,7 @@ def safeformat(obj: object) -> str:
 
 
 # Maximum size of overall repr of objects to display during assertion errors.
-DEFAULT_REPR_MAX_SIZE = 240
+DEFAULT_REPR_MAX_SIZE = int(os.environ.get("PYTEST_DEFAULT_REPR_MAX_SIZE", 240))
 
 
 def saferepr(