diff --git a/migrations_lockfile.txt b/migrations_lockfile.txt
index 77523d6ec01735..38c7df916d9b03 100644
--- a/migrations_lockfile.txt
+++ b/migrations_lockfile.txt
@@ -10,7 +10,7 @@ hybridcloud: 0016_add_control_cacheversion
 nodestore: 0002_nodestore_no_dictfield
 remote_subscriptions: 0003_drop_remote_subscription
 replays: 0004_index_together
-sentry: 0769_add_seer_fields_to_grouphash_metadata
+sentry: 0770_increase_project_slug_max_length
 social_auth: 0002_default_auto_field
 uptime: 0014_add_uptime_enviromnet
 workflow_engine: 0007_loosen_workflow_action_relationship
diff --git a/src/sentry/api/endpoints/organization_teams.py b/src/sentry/api/endpoints/organization_teams.py
index 505c6bc3d76fb0..5b7f1f6bea4562 100644
--- a/src/sentry/api/endpoints/organization_teams.py
+++ b/src/sentry/api/endpoints/organization_teams.py
@@ -18,6 +18,7 @@
 from sentry.apidocs.examples.team_examples import TeamExamples
 from sentry.apidocs.parameters import CursorQueryParam, GlobalParams, TeamParams
 from sentry.apidocs.utils import inline_sentry_response_serializer
+from sentry.db.models.fields.slug import DEFAULT_SLUG_MAX_LENGTH
 from sentry.integrations.models.external_actor import ExternalActor
 from sentry.models.organizationmember import OrganizationMember
 from sentry.models.organizationmemberteam import OrganizationMemberTeam
@@ -44,7 +45,7 @@ class TeamPostSerializer(serializers.Serializer):
     slug = SentrySerializerSlugField(
         help_text="""Uniquely identifies a team and is used for the interface. If not
         provided, it is automatically generated from the name.""",
-        max_length=50,
+        max_length=DEFAULT_SLUG_MAX_LENGTH,
         required=False,
         allow_null=True,
     )
diff --git a/src/sentry/api/endpoints/project_details.py b/src/sentry/api/endpoints/project_details.py
index 8643183113771c..96e265e5eec1d2 100644
--- a/src/sentry/api/endpoints/project_details.py
+++ b/src/sentry/api/endpoints/project_details.py
@@ -45,7 +45,7 @@
 )
 from sentry.lang.native.utils import STORE_CRASH_REPORTS_MAX, convert_crashreport_count
 from sentry.models.group import Group, GroupStatus
-from sentry.models.project import Project
+from sentry.models.project import PROJECT_SLUG_MAX_LENGTH, Project
 from sentry.models.projectbookmark import ProjectBookmark
 from sentry.models.projectredirect import ProjectRedirect
 from sentry.notifications.utils import has_alert_integration
@@ -135,7 +135,7 @@ class ProjectAdminSerializer(ProjectMemberSerializer):
     )
     slug = SentrySerializerSlugField(
         help_text="Uniquely identifies a project and is used for the interface.",
-        max_length=50,
+        max_length=PROJECT_SLUG_MAX_LENGTH,
         required=False,
     )
     platform = serializers.CharField(
diff --git a/src/sentry/api/endpoints/team_details.py b/src/sentry/api/endpoints/team_details.py
index 69ec7a73b26cdb..13c984e014afe5 100644
--- a/src/sentry/api/endpoints/team_details.py
+++ b/src/sentry/api/endpoints/team_details.py
@@ -23,6 +23,7 @@
 )
 from sentry.apidocs.examples.team_examples import TeamExamples
 from sentry.apidocs.parameters import GlobalParams, TeamParams
+from sentry.db.models.fields.slug import DEFAULT_SLUG_MAX_LENGTH
 from sentry.deletions.models.scheduleddeletion import RegionScheduledDeletion
 from sentry.models.team import Team, TeamStatus
 
@@ -30,7 +31,7 @@
 @extend_schema_serializer(exclude_fields=["name"])
 class TeamDetailsSerializer(CamelSnakeModelSerializer):
     slug = SentrySerializerSlugField(
-        max_length=50,
+        max_length=DEFAULT_SLUG_MAX_LENGTH,
         help_text="Uniquely identifies a team. This is must be available.",
     )
 
diff --git a/src/sentry/api/endpoints/team_projects.py b/src/sentry/api/endpoints/team_projects.py
index 73ce44a11de871..98fadbfd2a7142 100644
--- a/src/sentry/api/endpoints/team_projects.py
+++ b/src/sentry/api/endpoints/team_projects.py
@@ -22,7 +22,7 @@
 from sentry.apidocs.parameters import CursorQueryParam, GlobalParams
 from sentry.apidocs.utils import inline_sentry_response_serializer
 from sentry.constants import RESERVED_PROJECT_SLUGS, ObjectStatus
-from sentry.models.project import Project
+from sentry.models.project import PROJECT_SLUG_MAX_LENGTH, Project
 from sentry.models.team import Team
 from sentry.seer.similarity.utils import project_is_seer_eligible
 from sentry.signals import project_created
@@ -38,7 +38,7 @@ class ProjectPostSerializer(serializers.Serializer):
     slug = SentrySerializerSlugField(
         help_text="""Uniquely identifies a project and is used for the interface.
         If not provided, it is automatically generated from the name.""",
-        max_length=50,
+        max_length=PROJECT_SLUG_MAX_LENGTH,
         required=False,
         allow_null=True,
     )
diff --git a/src/sentry/api/fields/sentry_slug.py b/src/sentry/api/fields/sentry_slug.py
index 6301e9483eaffc..24eecce61da290 100644
--- a/src/sentry/api/fields/sentry_slug.py
+++ b/src/sentry/api/fields/sentry_slug.py
@@ -4,6 +4,7 @@
 from drf_spectacular.utils import extend_schema_field
 from rest_framework import serializers
 
+from sentry.db.models.fields.slug import DEFAULT_SLUG_MAX_LENGTH
 from sentry.slug.errors import DEFAULT_SLUG_ERROR_MESSAGE, ORG_SLUG_ERROR_MESSAGE
 from sentry.slug.patterns import MIXED_SLUG_PATTERN, ORG_SLUG_PATTERN
 
@@ -24,6 +25,7 @@ def __init__(
         self,
         error_messages=None,
         org_slug: bool = False,
+        max_length: int = DEFAULT_SLUG_MAX_LENGTH,
         *args,
         **kwargs,
     ):
@@ -37,4 +39,6 @@ def __init__(
             pattern = ORG_SLUG_PATTERN
             error_messages["invalid"] = ORG_SLUG_ERROR_MESSAGE
 
-        super().__init__(pattern, error_messages=error_messages, *args, **kwargs)
+        super().__init__(
+            pattern, error_messages=error_messages, max_length=max_length, *args, **kwargs
+        )
diff --git a/src/sentry/api/serializers/models/organization.py b/src/sentry/api/serializers/models/organization.py
index 0b4d6c72caaf19..8cba629e2739c2 100644
--- a/src/sentry/api/serializers/models/organization.py
+++ b/src/sentry/api/serializers/models/organization.py
@@ -51,6 +51,7 @@
     UPTIME_AUTODETECTION,
     ObjectStatus,
 )
+from sentry.db.models.fields.slug import DEFAULT_SLUG_MAX_LENGTH
 from sentry.dynamic_sampling.tasks.common import get_organization_volume
 from sentry.dynamic_sampling.tasks.helpers.sliding_window import get_sliding_window_org_sample_rate
 from sentry.killswitches import killswitch_matches_context
@@ -101,7 +102,7 @@ class BaseOrganizationSerializer(serializers.Serializer):
     # 3. cannot end with a dash
     slug = SentrySerializerSlugField(
         org_slug=True,
-        max_length=50,
+        max_length=DEFAULT_SLUG_MAX_LENGTH,
     )
 
     def validate_slug(self, value: str) -> str:
diff --git a/src/sentry/db/models/fields/slug.py b/src/sentry/db/models/fields/slug.py
index fa435e4a930665..ebb57ea2efbbc2 100644
--- a/src/sentry/db/models/fields/slug.py
+++ b/src/sentry/db/models/fields/slug.py
@@ -3,6 +3,8 @@
 
 from sentry.slug.validators import no_numeric_validator, org_slug_validator
 
+DEFAULT_SLUG_MAX_LENGTH = 50
+
 
 class SentrySlugField(SlugField):
     default_validators = [*SlugField.default_validators, no_numeric_validator]
diff --git a/src/sentry/migrations/0770_increase_project_slug_max_length.py b/src/sentry/migrations/0770_increase_project_slug_max_length.py
new file mode 100644
index 00000000000000..c131b8b6fe76a2
--- /dev/null
+++ b/src/sentry/migrations/0770_increase_project_slug_max_length.py
@@ -0,0 +1,34 @@
+# Generated by Django 5.1.1 on 2024-09-30 19:46
+
+from django.db import migrations
+
+import sentry.db.models.fields.slug
+from sentry.new_migrations.migrations import CheckedMigration
+
+
+class Migration(CheckedMigration):
+    # This flag is used to mark that a migration shouldn't be automatically run in production.
+    # This should only be used for operations where it's safe to run the migration after your
+    # code has deployed. So this should not be used for most operations that alter the schema
+    # of a table.
+    # Here are some things that make sense to mark as post deployment:
+    # - Large data migrations. Typically we want these to be run manually so that they can be
+    #   monitored and not block the deploy for a long period of time while they run.
+    # - Adding indexes to large tables. Since this can take a long time, we'd generally prefer to
+    #   run this outside deployments so that we don't block them. Note that while adding an index
+    #   is a schema change, it's completely safe to run the operation after the code has deployed.
+    # Once deployed, run these manually via: https://develop.sentry.dev/database-migrations/#migration-deployment
+
+    is_post_deployment = True
+
+    dependencies = [
+        ("sentry", "0769_add_seer_fields_to_grouphash_metadata"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="project",
+            name="slug",
+            field=sentry.db.models.fields.slug.SentrySlugField(max_length=100, null=True),
+        ),
+    ]
diff --git a/src/sentry/models/project.py b/src/sentry/models/project.py
index 7959088256ab8f..8cadf8fad3a5a2 100644
--- a/src/sentry/models/project.py
+++ b/src/sentry/models/project.py
@@ -54,6 +54,7 @@
     from sentry.users.models.user import User
 
 SENTRY_USE_SNOWFLAKE = getattr(settings, "SENTRY_USE_SNOWFLAKE", False)
+PROJECT_SLUG_MAX_LENGTH = 100
 
 # NOTE:
 # - When you modify this list, ensure that the platform IDs listed in "sentry/static/app/data/platforms.tsx" match.
@@ -232,7 +233,7 @@ class Project(Model, PendingDeletionMixin):
 
     __relocation_scope__ = RelocationScope.Organization
 
-    slug = SentrySlugField(null=True)
+    slug = SentrySlugField(null=True, max_length=PROJECT_SLUG_MAX_LENGTH)
     # DEPRECATED do not use, prefer slug
     name = models.CharField(max_length=200)
     forced_color = models.CharField(max_length=6, null=True, blank=True)
diff --git a/src/sentry/monitors/constants.py b/src/sentry/monitors/constants.py
index 8f06d3589dff4a..fb19678754fc46 100644
--- a/src/sentry/monitors/constants.py
+++ b/src/sentry/monitors/constants.py
@@ -16,9 +16,6 @@
 # being marked as missed
 DEFAULT_CHECKIN_MARGIN = 1
 
-# Enforced maximum length of the monitor slug
-MAX_SLUG_LENGTH = 50
-
 
 class PermitCheckInStatus(Enum):
     ACCEPT = 0
diff --git a/src/sentry/monitors/models.py b/src/sentry/monitors/models.py
index 01d40e872da4c6..017d0c9e1dbf49 100644
--- a/src/sentry/monitors/models.py
+++ b/src/sentry/monitors/models.py
@@ -31,13 +31,12 @@
     sane_repr,
 )
 from sentry.db.models.fields.hybrid_cloud_foreign_key import HybridCloudForeignKey
-from sentry.db.models.fields.slug import SentrySlugField
+from sentry.db.models.fields.slug import DEFAULT_SLUG_MAX_LENGTH, SentrySlugField
 from sentry.db.models.manager.base import BaseManager
 from sentry.db.models.utils import slugify_instance
 from sentry.locks import locks
 from sentry.models.environment import Environment
 from sentry.models.rule import Rule, RuleSource
-from sentry.monitors.constants import MAX_SLUG_LENGTH
 from sentry.monitors.types import CrontabSchedule, IntervalSchedule
 from sentry.types.actor import Actor
 from sentry.utils.retries import TimedRetryPolicy
@@ -296,7 +295,7 @@ def save(self, *args, **kwargs):
                     self,
                     self.name,
                     organization_id=self.organization_id,
-                    max_length=MAX_SLUG_LENGTH,
+                    max_length=DEFAULT_SLUG_MAX_LENGTH,
                 )
         return super().save(*args, **kwargs)
 
diff --git a/src/sentry/monitors/types.py b/src/sentry/monitors/types.py
index 7a1832983c490f..50f17140da8558 100644
--- a/src/sentry/monitors/types.py
+++ b/src/sentry/monitors/types.py
@@ -8,7 +8,7 @@
 from django.utils.text import slugify
 from sentry_kafka_schemas.schema_types.ingest_monitors_v1 import CheckIn
 
-from sentry.monitors.constants import MAX_SLUG_LENGTH
+from sentry.db.models.fields.slug import DEFAULT_SLUG_MAX_LENGTH
 
 
 class CheckinTrace(TypedDict):
@@ -70,7 +70,7 @@ class CheckinItem:
 
     @cached_property
     def valid_monitor_slug(self):
-        return slugify(self.payload["monitor_slug"])[:MAX_SLUG_LENGTH].strip("-")
+        return slugify(self.payload["monitor_slug"])[:DEFAULT_SLUG_MAX_LENGTH].strip("-")
 
     @property
     def processing_key(self):
diff --git a/src/sentry/monitors/validators.py b/src/sentry/monitors/validators.py
index 931c497e6cead2..417540964f9fb2 100644
--- a/src/sentry/monitors/validators.py
+++ b/src/sentry/monitors/validators.py
@@ -16,7 +16,8 @@
 from sentry.api.serializers.rest_framework.project import ProjectField
 from sentry.constants import ObjectStatus
 from sentry.db.models import BoundedPositiveIntegerField
-from sentry.monitors.constants import MAX_SLUG_LENGTH, MAX_THRESHOLD, MAX_TIMEOUT
+from sentry.db.models.fields.slug import DEFAULT_SLUG_MAX_LENGTH
+from sentry.monitors.constants import MAX_THRESHOLD, MAX_TIMEOUT
 from sentry.monitors.models import CheckInStatus, Monitor, MonitorType, ScheduleType
 from sentry.monitors.schedule import get_next_schedule, get_prev_schedule
 from sentry.monitors.types import CrontabSchedule
@@ -246,7 +247,7 @@ class MonitorValidator(CamelSnakeSerializer):
         help_text="Name of the monitor. Used for notifications.",
     )
     slug = SentrySerializerSlugField(
-        max_length=MAX_SLUG_LENGTH,
+        max_length=DEFAULT_SLUG_MAX_LENGTH,
         required=False,
         help_text="Uniquely identifies your monitor within your organization. Changing this slug will require updates to any instrumented check-in calls.",
     )