diff --git a/app/components/DisksTableField.tsx b/app/components/fields/DisksTableField.tsx
similarity index 97%
rename from app/components/DisksTableField.tsx
rename to app/components/fields/DisksTableField.tsx
index 87ce56e718..59033f0f26 100644
--- a/app/components/DisksTableField.tsx
+++ b/app/components/fields/DisksTableField.tsx
@@ -9,7 +9,7 @@ import {
   MiniTable,
   SideModal,
 } from '@oxide/ui'
-import type { FormValues } from '../forms'
+import type { FormValues } from '../../forms'
 
 type DiskTableItem =
   | (FormValues<'disk-create'> & { type: 'create' })
@@ -38,7 +38,7 @@ export function DisksTableField() {
             <MiniTable.Body>
               {items.map((item, index) => (
                 <MiniTable.Row
-                  tabindex="0"
+                  tabIndex="0"
                   aria-rowindex={index + 1}
                   aria-label={`Name: ${item.name}, Type: ${item.type}`}
                   key={item.name}
diff --git a/app/components/fields/NetworkInterfaceField.tsx b/app/components/fields/NetworkInterfaceField.tsx
new file mode 100644
index 0000000000..406e545bd1
--- /dev/null
+++ b/app/components/fields/NetworkInterfaceField.tsx
@@ -0,0 +1,121 @@
+import React, { useState } from 'react'
+import { useField } from 'formik'
+import { Button, Error16Icon, MiniTable, Radio, SideModal } from '@oxide/ui'
+import type {
+  InstanceNetworkInterfaceAttachment,
+  NetworkInterfaceCreate,
+} from '@oxide/api'
+import { RadioField } from '@oxide/form'
+import CreateNetworkInterfaceForm from 'app/forms/network-interface-create'
+
+export function NetworkInterfaceField() {
+  const [showForm, setShowForm] = useState(false)
+
+  /**
+   * Used to preserve previous user choices in case they accidentally
+   * change the radio selection
+   */
+  const [oldParams, setOldParams] = useState<NetworkInterfaceCreate[]>([])
+
+  const [, { value }, { setValue }] =
+    useField<InstanceNetworkInterfaceAttachment>({ name: 'networkInterfaces' })
+
+  return (
+    <div className="max-w-lg space-y-5">
+      <RadioField
+        id="network-interface-type"
+        name="networkInterfaceType"
+        column
+        label="Network interface"
+        className="pt-1"
+        onChange={(event) => {
+          const newType = event.target
+            .value as InstanceNetworkInterfaceAttachment['type']
+
+          if (value.type === 'Create') {
+            setOldParams(value.params)
+          }
+
+          newType === 'Create'
+            ? setValue({ type: newType, params: oldParams })
+            : setValue({
+                type: newType,
+              })
+        }}
+      >
+        <Radio value="None">None</Radio>
+        <Radio value="Default">Default</Radio>
+        <Radio value="Create">Custom</Radio>
+      </RadioField>
+      {value.type === 'Create' && (
+        <>
+          {value.params.length > 0 && (
+            <MiniTable className="mb-4">
+              <MiniTable.Header>
+                <MiniTable.HeadCell>Name</MiniTable.HeadCell>
+                <MiniTable.HeadCell>VPC</MiniTable.HeadCell>
+                <MiniTable.HeadCell>Subnet</MiniTable.HeadCell>
+                {/* For remove button */}
+                <MiniTable.HeadCell className="w-12" />
+              </MiniTable.Header>
+              <MiniTable.Body>
+                {value.params.map((item, index) => (
+                  <MiniTable.Row
+                    tabIndex="0"
+                    aria-rowindex={index + 1}
+                    aria-label={`Name: ${item.name}, Vpc: ${item.vpcName}, Subnet: ${item.subnetName}`}
+                    key={item.name}
+                  >
+                    <MiniTable.Cell>{item.name}</MiniTable.Cell>
+                    <MiniTable.Cell>{item.vpcName}</MiniTable.Cell>
+                    <MiniTable.Cell>{item.subnetName}</MiniTable.Cell>
+                    <MiniTable.Cell>
+                      <Button
+                        variant="link"
+                        onClick={() =>
+                          setValue({
+                            type: 'Create',
+                            params: value.params.filter(
+                              (i) => i.name !== item.name
+                            ),
+                          })
+                        }
+                      >
+                        <Error16Icon title={`remove ${item.name}`} />
+                      </Button>
+                    </MiniTable.Cell>
+                  </MiniTable.Row>
+                ))}
+              </MiniTable.Body>
+            </MiniTable>
+          )}
+
+          <SideModal
+            id="create-disk-modal"
+            isOpen={showForm}
+            onDismiss={() => setShowForm(false)}
+          >
+            <CreateNetworkInterfaceForm
+              onSubmit={(networkInterface) => {
+                setValue({
+                  type: 'Create',
+                  params: [...value.params, networkInterface],
+                })
+                setShowForm(false)
+              }}
+            />
+          </SideModal>
+          <div className="space-x-3">
+            <Button
+              variant="secondary"
+              size="sm"
+              onClick={() => setShowForm(true)}
+            >
+              Add network interface
+            </Button>
+          </div>
+        </>
+      )}
+    </div>
+  )
+}
diff --git a/app/forms/index.ts b/app/forms/index.ts
index 6154e968f0..d108b81355 100644
--- a/app/forms/index.ts
+++ b/app/forms/index.ts
@@ -8,6 +8,7 @@ import type { CreateProjectForm } from './project-create'
 import type { CreateVpcForm } from './vpc-create'
 import type CreateInstanceForm from './instance-create'
 import type AttachDiskForm from './disk-attach'
+import type CreateNetworkInterfaceForm from './network-interface-create'
 
 import type { FormProps } from '@oxide/form'
 import type { ErrorResponse } from '@oxide/api'
@@ -26,6 +27,7 @@ export interface FormTypes {
   'disk-create': typeof CreateDiskForm
   'subnet-create': typeof CreateSubnetForm
   'subnet-edit': typeof EditSubnetForm
+  'network-interface-create': typeof CreateNetworkInterfaceForm
   'vpc-create': typeof CreateVpcForm
 }
 
diff --git a/app/forms/instance-create.tsx b/app/forms/instance-create.tsx
index 8652ecc98b..b859b8b0b0 100644
--- a/app/forms/instance-create.tsx
+++ b/app/forms/instance-create.tsx
@@ -25,8 +25,9 @@ import {
   WindowsResponsiveIcon,
 } from '@oxide/ui'
 import { useParams, useToast } from 'app/hooks'
-import { DisksTableField } from 'app/components/DisksTableField'
+import { DisksTableField } from 'app/components/fields/DisksTableField'
 import filesize from 'filesize'
+import { NetworkInterfaceField } from 'app/components/fields/NetworkInterfaceField'
 
 const values = {
   name: '',
@@ -36,6 +37,12 @@ const values = {
   hostname: '',
   disks: [],
   attachedDisks: [],
+  networkInterfaces: { type: 'Default' },
+  /**
+   * This is a hack to ensure the network interface radio has a default selection.
+   * We actually don't care about this value outside of that.
+   */
+  networkInterfaceType: 'Default',
 }
 
 export default function CreateInstanceForm({
@@ -210,6 +217,8 @@ export default function CreateInstanceForm({
       <Divider />
       <Form.Heading id="networking">Networking</Form.Heading>
 
+      <NetworkInterfaceField />
+
       <TextField
         id="hostname"
         description="Will be generated if not provided"
diff --git a/app/forms/network-interface-create.tsx b/app/forms/network-interface-create.tsx
new file mode 100644
index 0000000000..7968ea14f6
--- /dev/null
+++ b/app/forms/network-interface-create.tsx
@@ -0,0 +1,84 @@
+import React from 'react'
+import { DescriptionField, Form, NameField, TextField } from '@oxide/form'
+import { Divider } from '@oxide/ui'
+import type { NetworkInterfaceCreate, NetworkInterface } from '@oxide/api'
+import { useApiMutation, useApiQueryClient } from '@oxide/api'
+
+import type { PrebuiltFormProps } from 'app/forms'
+import { useParams } from 'app/hooks'
+import invariant from 'tiny-invariant'
+
+const values: NetworkInterfaceCreate = {
+  name: '',
+  description: '',
+  ip: '',
+  subnetName: '',
+  vpcName: '',
+}
+
+export default function CreateNetworkInterfaceForm({
+  id = 'create-network-interface-form',
+  title = 'Add Network Interface',
+  initialValues = values,
+  onSubmit,
+  onSuccess,
+  onError,
+  ...props
+}: PrebuiltFormProps<NetworkInterfaceCreate, NetworkInterface>) {
+  const queryClient = useApiQueryClient()
+  const pathParams = useParams('orgName', 'projectName')
+
+  const createNetworkInterface = useApiMutation(
+    'instanceNetworkInterfacesPost',
+    {
+      onSuccess(data) {
+        const { instanceName, ...others } = pathParams
+        invariant(
+          instanceName,
+          'instanceName is required when posting a network interface'
+        )
+        queryClient.invalidateQueries('instanceNetworkInterfacesGet', {
+          instanceName,
+          ...others,
+        })
+        onSuccess?.(data)
+      },
+      onError,
+    }
+  )
+
+  return (
+    <Form
+      id={id}
+      title={title}
+      initialValues={initialValues}
+      onSubmit={
+        onSubmit ||
+        ((body) => {
+          const { instanceName, ...others } = pathParams
+          invariant(
+            instanceName,
+            'instanceName is required when posting a network interface'
+          )
+          createNetworkInterface.mutate({ instanceName, ...others, body })
+        })
+      }
+      mutation={createNetworkInterface}
+      {...props}
+    >
+      <NameField id="nic-name" />
+      <DescriptionField id="nic-description" />
+      <Divider />
+
+      {/* TODO: Convert these into combo boxes */}
+      <TextField id="nic-vpc" name="vpcName" label="VPC" required />
+      <TextField id="nic-subnet" name="subnetName" label="Subnet" required />
+      <TextField id="nic-ip" name="ip" label="IP Address" />
+
+      <Form.Actions>
+        <Form.Submit>{title}</Form.Submit>
+        <Form.Cancel />
+      </Form.Actions>
+    </Form>
+  )
+}
diff --git a/libs/ui/lib/radio-group/RadioGroup.tsx b/libs/ui/lib/radio-group/RadioGroup.tsx
index 22a70e3205..f645221e23 100644
--- a/libs/ui/lib/radio-group/RadioGroup.tsx
+++ b/libs/ui/lib/radio-group/RadioGroup.tsx
@@ -58,6 +58,8 @@ export type RadioGroupProps = {
   // For vertical layout of regular Radios. Leave it off for RadioCards.
   column?: boolean
   className?: string
+
+  onChange?: (event: React.ChangeEvent<HTMLInputElement>) => void
 }
 
 export const RadioGroup = ({
@@ -67,6 +69,7 @@ export const RadioGroup = ({
   disabled,
   column,
   className,
+  onChange,
 }: RadioGroupProps) => (
   <div
     className={cn(
@@ -75,6 +78,7 @@ export const RadioGroup = ({
       className
     )}
     role="radiogroup"
+    onChange={onChange}
   >
     {React.Children.map(children, (radio) =>
       React.cloneElement(radio, { name, required, disabled })
diff --git a/libs/ui/lib/side-modal/SideModal.tsx b/libs/ui/lib/side-modal/SideModal.tsx
index f101de5ba7..d67c632bb1 100644
--- a/libs/ui/lib/side-modal/SideModal.tsx
+++ b/libs/ui/lib/side-modal/SideModal.tsx
@@ -65,7 +65,7 @@ SideModal.Title = ({ id, children }: SideModalTitleProps) => {
   )
 }
 
-SideModal.Body = classed.div`body relative overflow-y-auto h-full`
+SideModal.Body = classed.div`body relative overflow-y-auto h-full pb-6`
 
 SideModal.Section = classed.div`p-8 space-y-6 border-secondary`