diff --git a/src/loaders/neoforge/neoforge-environment-type.ts b/src/loaders/neoforge/neoforge-environment-type.ts
new file mode 100644
index 0000000..718f232
--- /dev/null
+++ b/src/loaders/neoforge/neoforge-environment-type.ts
@@ -0,0 +1,44 @@
+import { Enum, EnumOptions } from "@/utils/enum";
+
+/**
+ * Represents the different physical sides that a NeoForge mod can run on.
+ */
+enum NeoForgeEnvironmentTypeValues {
+    /**
+     * Present on the client side.
+     */
+    CLIENT = "CLIENT",
+
+    /**
+     * Present on the dedicated server.
+     */
+    SERVER = "SERVER",
+
+    /**
+     * Present on both the client and server side.
+     */
+    BOTH = "BOTH",
+}
+
+/**
+ * Options for configuring the behavior of the `NeoForgeEnvironmentType` enum.
+ */
+const NeoForgeEnvironmentTypeOptions: EnumOptions = {
+    /**
+     * Ignore the case of the environment type string when parsing.
+     */
+    ignoreCase: true,
+};
+
+/**
+ * Represents the different physical sides that a NeoForge mod can run on.
+ */
+export const NeoForgeEnvironmentType = Enum.create(
+    NeoForgeEnvironmentTypeValues,
+    NeoForgeEnvironmentTypeOptions,
+);
+
+/**
+ * Represents the different physical sides that a NeoForge mod can run on.
+ */
+export type NeoForgeEnvironmentType = Enum<typeof NeoForgeEnvironmentTypeValues>;
diff --git a/tests/unit/loaders/neoforge/neoforge-environment-type.spec.ts b/tests/unit/loaders/neoforge/neoforge-environment-type.spec.ts
new file mode 100644
index 0000000..db4baa8
--- /dev/null
+++ b/tests/unit/loaders/neoforge/neoforge-environment-type.spec.ts
@@ -0,0 +1,29 @@
+import { NeoForgeEnvironmentType } from "@/loaders/neoforge/neoforge-environment-type";
+
+describe("NeoForgeEnvironmentType", () => {
+    describe("parse", () => {
+        test("parses all its own formatted values", () => {
+            for (const value of NeoForgeEnvironmentType.values()) {
+                expect(NeoForgeEnvironmentType.parse(NeoForgeEnvironmentType.format(value))).toBe(value);
+            }
+        });
+
+        test("parses all friendly names of its own values", () => {
+            for (const value of NeoForgeEnvironmentType.values()) {
+                expect(NeoForgeEnvironmentType.parse(NeoForgeEnvironmentType.friendlyNameOf(value))).toBe(value);
+            }
+        });
+
+        test("parses all its own formatted values in lowercase", () => {
+            for (const value of NeoForgeEnvironmentType.values()) {
+                expect(NeoForgeEnvironmentType.parse(NeoForgeEnvironmentType.format(value).toLowerCase())).toBe(value);
+            }
+        });
+
+        test("parses all its own formatted values in UPPERCASE", () => {
+            for (const value of NeoForgeEnvironmentType.values()) {
+                expect(NeoForgeEnvironmentType.parse(NeoForgeEnvironmentType.format(value).toUpperCase())).toBe(value);
+            }
+        });
+    });
+});