diff --git a/aries_cloudagent/config/argparse.py b/aries_cloudagent/config/argparse.py
index 8132ad51e2..1f676f9dd2 100644
--- a/aries_cloudagent/config/argparse.py
+++ b/aries_cloudagent/config/argparse.py
@@ -7,6 +7,7 @@
 from typing import Type
 
 from .error import ArgsParseError
+from .util import ByteSize
 
 CAT_PROVISION = "general"
 CAT_START = "start"
@@ -574,7 +575,6 @@ def add_arguments(self, parser: ArgumentParser):
             be specified multiple times to create multiple interfaces.\
             Supported inbound transport types are 'http' and 'ws'.",
         )
-
         parser.add_argument(
             "-ot",
             "--outbound-transport",
@@ -588,7 +588,6 @@ def add_arguments(self, parser: ArgumentParser):
             multiple times to supoort multiple transport types. Supported outbound\
             transport types are 'http' and 'ws'.",
         )
-
         parser.add_argument(
             "-e",
             "--endpoint",
@@ -605,7 +604,6 @@ def add_arguments(self, parser: ArgumentParser):
             The endpoints are used in the formation of a connection \
             with another agent.",
         )
-
         parser.add_argument(
             "-l",
             "--label",
@@ -614,6 +612,13 @@ def add_arguments(self, parser: ArgumentParser):
             help="Specifies the label for this agent. This label is publicized\
             (self-attested) to other agents as part of forming a connection.",
         )
+        parser.add_argument(
+            "--max-message-size",
+            default=2097152,
+            type=ByteSize(min_size=1024),
+            metavar="<message-size>",
+            help="Set the maximum size in bytes for inbound agent messages.",
+        )
 
         parser.add_argument(
             "--enable-undelivered-queue",
@@ -635,6 +640,9 @@ def get_settings(self, args: Namespace):
             settings["additional_endpoints"] = args.endpoint[1:]
         if args.label:
             settings["default_label"] = args.label
+        if args.max_message_size:
+            settings["transport.max_message_size"] = args.max_message_size
+
         return settings
 
 
diff --git a/aries_cloudagent/config/tests/test_argparse.py b/aries_cloudagent/config/tests/test_argparse.py
index bb64b915f2..ae6dd85251 100644
--- a/aries_cloudagent/config/tests/test_argparse.py
+++ b/aries_cloudagent/config/tests/test_argparse.py
@@ -1,9 +1,10 @@
 import itertools
-from argparse import ArgumentParser
+from argparse import ArgumentParser, ArgumentTypeError
 
 from asynctest import TestCase as AsyncTestCase, mock as async_mock
 
 from .. import argparse
+from ..util import ByteSize
 
 
 class TestArgParse(AsyncTestCase):
@@ -41,13 +42,16 @@ async def test_transport_settings(self):
                 "http",
                 "-e",
                 "http://default.endpoint/",
-                "ws://alternate.endpoint/"
+                "ws://alternate.endpoint/",
             ]
         )
 
         assert result.inbound_transports == [["http", "0.0.0.0", "80"]]
         assert result.outbound_transports == ["http"]
-        assert result.endpoint == ["http://default.endpoint/", "ws://alternate.endpoint/"]
+        assert result.endpoint == [
+            "http://default.endpoint/",
+            "ws://alternate.endpoint/",
+        ]
 
         settings = group.get_settings(result)
 
@@ -55,3 +59,34 @@ async def test_transport_settings(self):
         assert settings.get("transport.outbound_configs") == ["http"]
         assert settings.get("default_endpoint") == "http://default.endpoint/"
         assert settings.get("additional_endpoints") == ["ws://alternate.endpoint/"]
+
+    def test_bytesize(self):
+        bs = ByteSize()
+        with self.assertRaises(ArgumentTypeError):
+            bs(None)
+        with self.assertRaises(ArgumentTypeError):
+            bs("")
+        with self.assertRaises(ArgumentTypeError):
+            bs("a")
+        with self.assertRaises(ArgumentTypeError):
+            bs("1.5")
+        with self.assertRaises(ArgumentTypeError):
+            bs("-1")
+        assert bs("101") == 101
+        assert bs("101b") == 101
+        assert bs("101KB") == 103424
+        assert bs("2M") == 2097152
+        assert bs("1G") == 1073741824
+        assert bs("1t") == 1099511627776
+
+        bs = ByteSize(min_size=10)
+        with self.assertRaises(ArgumentTypeError):
+            bs("5")
+        assert bs("12") == 12
+
+        bs = ByteSize(max_size=10)
+        with self.assertRaises(ArgumentTypeError):
+            bs("15")
+        assert bs("10") == 10
+
+        assert repr(bs) == "ByteSize"
diff --git a/aries_cloudagent/config/util.py b/aries_cloudagent/config/util.py
index 5fdfaebe86..a8ad9f9933 100644
--- a/aries_cloudagent/config/util.py
+++ b/aries_cloudagent/config/util.py
@@ -1,6 +1,9 @@
 """Entrypoint."""
 
 import os
+import re
+
+from argparse import ArgumentTypeError
 from typing import Any, Mapping
 
 from .logging import LoggingConfigurator
@@ -21,3 +24,43 @@ def common_config(settings: Mapping[str, Any]):
         and settings.get("wallet.storage_type") == "postgres_storage"
     ):
         load_postgres_plugin()
+
+
+class ByteSize:
+    """Argument value parser for byte sizes."""
+
+    def __init__(self, min_size: int = 0, max_size: int = 0):
+        """Initialize the ByteSize parser."""
+        self.min_size = min_size
+        self.max_size = max_size
+
+    def __call__(self, arg: str) -> int:
+        """Interpret the argument value."""
+        if not arg:
+            raise ArgumentTypeError("Expected value")
+        parts = re.match(r"^(\d+)([kKmMgGtT]?)[bB]?$", arg)
+        if not parts:
+            raise ArgumentTypeError("Invalid format")
+        size = int(parts[1])
+        suffix = parts[2].upper()
+        if suffix == "K":
+            size = size << 10
+        elif suffix == "M":
+            size = size << 20
+        elif suffix == "G":
+            size = size << 30
+        elif suffix == "T":
+            size = size << 40
+        if size < self.min_size:
+            raise ArgumentTypeError(
+                f"Size must be greater than or equal to {self.min_size}"
+            )
+        if self.max_size and size > self.max_size:
+            raise ArgumentTypeError(
+                f"Size must be less than or equal to {self.max_size}"
+            )
+        return size
+
+    def __repr__(self):
+        """Format for in error reporting."""
+        return self.__class__.__name__
diff --git a/aries_cloudagent/transport/inbound/base.py b/aries_cloudagent/transport/inbound/base.py
index a2c5ea52ec..b3c87a4196 100644
--- a/aries_cloudagent/transport/inbound/base.py
+++ b/aries_cloudagent/transport/inbound/base.py
@@ -14,12 +14,30 @@ class BaseInboundTransport(ABC):
     """Base inbound transport class."""
 
     def __init__(
-        self, scheme: str, create_session: Callable,
+        self,
+        scheme: str,
+        create_session: Callable,
+        *,
+        max_message_size: int = 0,
+        wire_format: BaseWireFormat = None,
     ):
-        """Initialize the inbound transport instance."""
+        """
+        Initialize the inbound transport instance.
+
+        Args:
+            scheme: The transport scheme identifier
+            create_session: Method to create a new inbound session
+        """
+
         self._create_session = create_session
+        self._max_message_size = max_message_size
         self._scheme = scheme
-        self.wire_format: BaseWireFormat = None
+        self.wire_format: BaseWireFormat = wire_format
+
+    @property
+    def max_message_size(self):
+        """Accessor for this transport's max message size."""
+        return self._max_message_size
 
     @property
     def scheme(self):
diff --git a/aries_cloudagent/transport/inbound/http.py b/aries_cloudagent/transport/inbound/http.py
index 73730aca5f..823dc70f5c 100644
--- a/aries_cloudagent/transport/inbound/http.py
+++ b/aries_cloudagent/transport/inbound/http.py
@@ -14,9 +14,9 @@
 class HttpTransport(BaseInboundTransport):
     """Http Transport class."""
 
-    def __init__(self, host: str, port: int, create_session) -> None:
+    def __init__(self, host: str, port: int, create_session, **kwargs) -> None:
         """
-        Initialize a Transport instance.
+        Initialize an inbound HTTP transport instance.
 
         Args:
             host: Host to listen on
@@ -24,14 +24,17 @@ def __init__(self, host: str, port: int, create_session) -> None:
             create_session: Method to create a new inbound session
 
         """
-        super().__init__("http", create_session)
+        super().__init__("http", create_session, **kwargs)
         self.host = host
         self.port = port
         self.site: web.BaseSite = None
 
     async def make_application(self) -> web.Application:
         """Construct the aiohttp application."""
-        app = web.Application()
+        app_args = {}
+        if self.max_message_size:
+            app_args["client_max_size"] = self.max_message_size
+        app = web.Application(**app_args)
         app.add_routes([web.get("/", self.invite_message_handler)])
         app.add_routes([web.post("/", self.inbound_message_handler)])
         return app
diff --git a/aries_cloudagent/transport/inbound/manager.py b/aries_cloudagent/transport/inbound/manager.py
index 4a48e8609d..ce32bc8968 100644
--- a/aries_cloudagent/transport/inbound/manager.py
+++ b/aries_cloudagent/transport/inbound/manager.py
@@ -37,6 +37,7 @@ def __init__(
     ):
         """Initialize an `InboundTransportManager` instance."""
         self.context = context
+        self.max_message_size = 0
         self.receive_inbound = receive_inbound
         self.return_inbound = return_inbound
         self.registered_transports = {}
@@ -48,6 +49,10 @@ def __init__(
 
     async def setup(self):
         """Perform setup operations."""
+        # Load config settings
+        if self.context.settings.get("transport.max_message_size"):
+            self.max_message_size = self.context.settings["transport.max_message_size"]
+
         inbound_transports = (
             self.context.settings.get("transport.inbound_configs") or []
         )
@@ -81,7 +86,12 @@ def register(self, config: InboundTransportConfiguration) -> str:
             ) from e
 
         return self.register_transport(
-            imported_class(config.host, config.port, self.create_session),
+            imported_class(
+                config.host,
+                config.port,
+                self.create_session,
+                max_message_size=self.max_message_size,
+            ),
             imported_class.__qualname__,
         )
 
diff --git a/aries_cloudagent/transport/inbound/ws.py b/aries_cloudagent/transport/inbound/ws.py
index d720ce733e..13de94f6c0 100644
--- a/aries_cloudagent/transport/inbound/ws.py
+++ b/aries_cloudagent/transport/inbound/ws.py
@@ -15,9 +15,9 @@
 class WsTransport(BaseInboundTransport):
     """Websockets Transport class."""
 
-    def __init__(self, host: str, port: int, create_session) -> None:
+    def __init__(self, host: str, port: int, create_session, **kwargs) -> None:
         """
-        Initialize a Transport instance.
+        Initialize an inbound WebSocket transport instance.
 
         Args:
             host: Host to listen on
@@ -25,7 +25,7 @@ def __init__(self, host: str, port: int, create_session) -> None:
             create_session: Method to create a new inbound session
 
         """
-        super().__init__("ws", create_session)
+        super().__init__("ws", create_session, **kwargs)
         self.host = host
         self.port = port
         self.site: web.BaseSite = None