diff --git a/cogs/__init__.py b/cogs/__init__.py
index 0c74de61..8c79dda3 100644
--- a/cogs/__init__.py
+++ b/cogs/__init__.py
@@ -18,6 +18,7 @@
     CheckSUPlatformAuthorisationCommandCog,
     CheckSUPlatformAuthorisationTaskCog,
 )
+from .colour_selector import MemberColourSelectorCommandCog
 from .command_error import CommandErrorCog
 from .committee_actions_tracking import (
     CommitteeActionsTrackingContextCommandCog,
@@ -76,6 +77,7 @@
     "MakeApplicantSlashCommandCog",
     "MakeMemberCommandCog",
     "ManualModerationCog",
+    "MemberColourSelectorCommandCog",
     "MemberCountCommandCog",
     "PingCommandCog",
     "RemindMeCommandCog",
@@ -117,6 +119,7 @@ def setup(bot: "TeXBot") -> None:
         MakeApplicantSlashCommandCog,
         MakeMemberCommandCog,
         ManualModerationCog,
+        MemberColourSelectorCommandCog,
         MemberCountCommandCog,
         PingCommandCog,
         RemindMeCommandCog,
diff --git a/cogs/colour_selector.py b/cogs/colour_selector.py
new file mode 100644
index 00000000..a5d23a19
--- /dev/null
+++ b/cogs/colour_selector.py
@@ -0,0 +1,156 @@
+"""Contains cog classes for the colour selector command."""
+
+import logging
+from typing import TYPE_CHECKING
+
+import discord
+
+from exceptions import DiscordMemberNotInMainGuildError, GuildDoesNotExistError
+from utils import CommandChecks, TeXBotBaseCog
+
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+    from collections.abc import Set as AbstractSet
+    from logging import Logger
+    from typing import Final
+
+    from utils import TeXBotApplicationContext, TeXBotAutocompleteContext
+
+
+__all__: "Sequence[str]" = ("MemberColourSelectorCommandCog",)
+
+
+logger: "Final[Logger]" = logging.getLogger("TeX-Bot")
+
+
+COLOUR_ROLE_NAMES: "Final[AbstractSet[str]]" = {  # TODO: Make this a config option in the future  # noqa: FIX002
+    "og-green",
+    "pink",
+    "orange",
+    "purple",
+    "new-green",
+    "yellow",
+    "red",
+}
+
+
+class MemberColourSelectorCommandCog(TeXBotBaseCog):
+    """Cog class for the colour selector command."""
+
+    @staticmethod
+    async def autocomplete_colour_roles(
+        ctx: "TeXBotAutocompleteContext",
+    ) -> "AbstractSet[discord.OptionChoice] | AbstractSet[str]":
+        """Autocomplete function for the colour roles option of the colour selector command."""
+        try:
+            main_guild: discord.Guild = ctx.bot.main_guild
+        except GuildDoesNotExistError:
+            return set()
+
+        return {
+            discord.OptionChoice(
+                name=role.name,
+                value=str(role.id),
+            )
+            for role in main_guild.roles
+            if role.name.lower() in COLOUR_ROLE_NAMES
+        }
+
+    @discord.slash_command(
+        name="member-colour-select",
+        description="Select a colour role for yourself.",
+    )
+    @discord.option(
+        name="colour-role",
+        description="The colour role you want to select.",
+        autocomplete=discord.utils.basic_autocomplete(autocomplete_colour_roles),
+        input_type=str,
+        required=True,
+        parameter_name="role_id_str",
+    )
+    @CommandChecks.check_interaction_user_in_main_guild
+    @CommandChecks.check_interaction_user_has_member_role
+    async def member_colour_select(
+        self, ctx: "TeXBotApplicationContext", role_id_str: str
+    ) -> None:
+        """Slash command for selecting a colour role for the user."""
+        # NOTE: Shortcut accessors are placed at the top of the function so that the exceptions they raise are displayed before any further errors may be sent
+        main_guild: discord.Guild = ctx.bot.main_guild
+        interaction_member: discord.Member | discord.User | None = ctx.interaction.user
+
+        await ctx.defer(ephemeral=True)
+
+        async with ctx.typing():
+            if not interaction_member:
+                await self.command_send_error(
+                    ctx=ctx,
+                    message="Interaction user was None for member-colour-select command run.",
+                )
+                return
+
+            try:
+                role_id_int = int(role_id_str)
+            except ValueError:
+                await ctx.respond(
+                    "The role ID you provided is not a valid role ID. "
+                    "Please use the autocomplete.",
+                    ephemeral=True,
+                )
+                return
+
+            role_to_add: discord.Role | None = discord.utils.get(
+                main_guild.roles, id=role_id_int
+            )
+
+            if not role_to_add:
+                await ctx.respond(
+                    "The role you selected does not exist. Please use the autocomplete.",
+                    ephemeral=True,
+                )
+                return
+
+            if role_to_add.name.lower() not in COLOUR_ROLE_NAMES:
+                await ctx.respond(
+                    f"{role_to_add.name} is not a valid colour role. "
+                    "Please use the autocomplete."
+                )
+                return
+
+            if isinstance(interaction_member, discord.User):
+                try:
+                    fetched_member: discord.Member = await self.bot.get_main_guild_member(
+                        interaction_member
+                    )
+                except DiscordMemberNotInMainGuildError:
+                    await ctx.respond(
+                        "You are not a member of the main guild. "
+                        "Please join the main guild to use this command.",
+                        ephemeral=True,
+                    )
+                    return
+
+                interaction_member = fetched_member
+
+            roles_to_remove: list[discord.Role] = [
+                role
+                for role in interaction_member.roles
+                if role.name.lower() in COLOUR_ROLE_NAMES
+            ]
+
+            if role_to_add in roles_to_remove:
+                roles_to_remove.remove(role_to_add)
+
+            if roles_to_remove:
+                await interaction_member.remove_roles(
+                    *roles_to_remove,
+                    reason=f"{interaction_member} used TeX-Bot /member-colour-select.",
+                )
+
+            await interaction_member.add_roles(
+                role_to_add,
+                reason=f"{interaction_member} used TeX-Bot /member-colour-select.",
+            )
+
+            await ctx.respond(
+                f"Successfully gave you the {role_to_add.name} colour role!", ephemeral=True
+            )
diff --git a/cogs/command_error.py b/cogs/command_error.py
index fcac8ee1..5248661c 100644
--- a/cogs/command_error.py
+++ b/cogs/command_error.py
@@ -62,6 +62,12 @@ async def on_application_command_error(
                     "members can run this command."
                 )
 
+            elif CommandChecks.is_interaction_user_has_member_role_failure(error.checks[0]):  # type: ignore[arg-type]
+                message = (
+                    f"Only {await self.bot.get_mention_string(self.bot.member_role)} "
+                    "members can run this command."
+                )
+
         else:
             logging_message = error
 
diff --git a/utils/command_checks.py b/utils/command_checks.py
index 8977e40a..2072ec22 100644
--- a/utils/command_checks.py
+++ b/utils/command_checks.py
@@ -65,6 +65,26 @@ async def _check(ctx: "TeXBotApplicationContext") -> bool:
             )
         )(func)
 
+    @staticmethod
+    def check_interaction_user_has_member_role[T: TeXBotBaseCog, **P](
+        func: "Callable[Concatenate[T, P], Awaitable[None]]",
+    ) -> "Callable[Concatenate[T, P], Awaitable[None]]":
+        """
+        Command check decorator to ensure the interaction user has the "Member" role.
+
+        If this check does not pass, the decorated command will not be executed.
+        Instead, an error message will be sent to the user.
+        """
+
+        async def _check(ctx: "TeXBotApplicationContext") -> bool:
+            return await ctx.bot.check_user_has_member_role(ctx.user)
+
+        return commands.check_any(
+            commands.check(
+                _check  # type: ignore[arg-type]
+            )
+        )(func)
+
     @classmethod
     def is_interaction_user_in_main_guild_failure(cls, check: "CheckFailure") -> bool:
         """Whether the check failed due to the user not being in your Discord guild."""
@@ -74,3 +94,8 @@ def is_interaction_user_in_main_guild_failure(cls, check: "CheckFailure") -> boo
     def is_interaction_user_has_committee_role_failure(cls, check: "CheckFailure") -> bool:
         """Whether the check failed due to the user not having the committee role."""
         return bool(check.__name__ == cls.check_interaction_user_has_committee_role.__name__)  # type: ignore[attr-defined]
+
+    @classmethod
+    def is_interaction_user_has_member_role_failure(cls, check: "CheckFailure") -> bool:
+        """Whether the check failed due to the user not having the Member role."""
+        return bool(check.__name__ == cls.check_interaction_user_has_member_role.__name__)  # type: ignore[attr-defined]
diff --git a/utils/tex_bot.py b/utils/tex_bot.py
index f86749fd..6830dca2 100644
--- a/utils/tex_bot.py
+++ b/utils/tex_bot.py
@@ -434,6 +434,10 @@ async def check_user_has_committee_role(self, user: discord.Member | discord.Use
         """Util method to validate whether the given user has the "Committee" role."""
         return await self.committee_role in (await self.get_main_guild_member(user)).roles
 
+    async def check_user_has_member_role(self, user: discord.Member | discord.User) -> bool:
+        """Util method to validate whether the given user has the "Member" role."""
+        return await self.member_role in (await self.get_main_guild_member(user)).roles
+
     def set_main_guild(self, main_guild: discord.Guild) -> None:
         """
         Set the main_guild value that TeX-Bot will reference in the future.