diff --git a/completion/_balena b/completion/_balena
index 0058ceab..7ed61a70 100644
--- a/completion/_balena
+++ b/completion/_balena
@@ -15,9 +15,9 @@ _balena() {
   block_cmds=( create )
   config_cmds=( generate inject read reconfigure write )
   device_type_cmds=( list )
-  device_cmds=( deactivate detect identify init list local-mode logs move note os-update pin public-url purge reboot register rename restart rm shutdown ssh start-service stop-service track-fleet tunnel )
+  device_cmds=( deactivate detect identify init list local-mode logs move note os-update pin public-url purge reboot register rename restart rm shutdown ssh start-service stop-service support track-fleet tunnel )
   env_cmds=( list rename rm set )
-  fleet_cmds=( create list pin purge rename restart rm track-latest )
+  fleet_cmds=( create list pin purge rename restart rm support track-latest )
   internal_cmds=( osinit )
   local_cmds=( configure flash )
   organization_cmds=( list )
diff --git a/completion/balena-completion.bash b/completion/balena-completion.bash
index 3aa1c25b..ac366b6b 100644
--- a/completion/balena-completion.bash
+++ b/completion/balena-completion.bash
@@ -14,9 +14,9 @@ _balena_complete()
   block_cmds="create"
   config_cmds="generate inject read reconfigure write"
   device_type_cmds="list"
-  device_cmds="deactivate detect identify init list local-mode logs move note os-update pin public-url purge reboot register rename restart rm shutdown ssh start-service stop-service track-fleet tunnel"
+  device_cmds="deactivate detect identify init list local-mode logs move note os-update pin public-url purge reboot register rename restart rm shutdown ssh start-service stop-service support track-fleet tunnel"
   env_cmds="list rename rm set"
-  fleet_cmds="create list pin purge rename restart rm track-latest"
+  fleet_cmds="create list pin purge rename restart rm support track-latest"
   internal_cmds="osinit"
   local_cmds="configure flash"
   organization_cmds="list"
diff --git a/docs/balena-cli.md b/docs/balena-cli.md
index f1ac7804..3f983cc2 100644
--- a/docs/balena-cli.md
+++ b/docs/balena-cli.md
@@ -222,6 +222,7 @@ are encouraged to regularly update the balena CLI to the latest version.
 	- [device ssh](#device-ssh)
 	- [device start-service](#device-start-service)
 	- [device stop-service](#device-stop-service)
+	- [device support](#device-support)
 	- [device track-fleet](#device-track-fleet)
 	- [device tunnel](#device-tunnel)
 
@@ -242,6 +243,7 @@ are encouraged to regularly update the balena CLI to the latest version.
 	- [fleet rename](#fleet-rename)
 	- [fleet restart](#fleet-restart)
 	- [fleet rm](#fleet-rm)
+	- [fleet support](#fleet-support)
 	- [fleet track-latest](#fleet-track-latest)
 
 - Local
@@ -2104,6 +2106,40 @@ comma-separated list (no blank spaces) of service names
 
 ### Options
 
+## device support
+
+### Description
+
+Grant or revoke balena support agent access to devices
+on balenaCloud. (This command does not apply to openBalena.)
+Access will be automatically revoked once the specified duration has elapsed.
+
+Duration defaults to 24h, but can be specified using --duration flag in days
+or hours, e.g. '12h', '2d'.
+
+Multiple values can specified as a comma-separated list (with no spaces).
+
+Examples:
+
+	balena support enable ab346f,cd457a --duration 3d
+	balena support disable ab346f,cd457a
+
+### Arguments
+
+#### ACTION
+
+enable|disable support access
+
+#### UUID
+
+comma-separated list (no blank spaces) of device UUIDs to be moved
+
+### Options
+
+#### -t, --duration DURATION
+
+length of time to enable support for, in (h)ours or (d)ays, e.g. 12h, 2d
+
 ## device track-fleet
 
 ### Description
@@ -2752,6 +2788,50 @@ fleet name or slug (preferred)
 
 answer "yes" to all questions (non interactive use)
 
+## fleet support
+
+### Description
+
+Grant or revoke balena support agent access to fleets
+on balenaCloud. (This command does not apply to openBalena.)
+Access will be automatically revoked once the specified duration has elapsed.
+
+Duration defaults to 24h, but can be specified using --duration flag in days
+or hours, e.g. '12h', '2d'.
+
+Multiple values can specified as a comma-separated list (with no spaces).
+
+Fleets may be specified by fleet name or slug. Fleet slugs are
+the recommended option, as they are unique and unambiguous. Slugs can be
+listed with the `balena fleet list` command. Note that slugs may change if the
+fleet is renamed. Fleet names are not unique and may result in  "Fleet is
+ambiguous" errors at any time (even if it "used to work in the past"), for
+example if the name clashes with a newly created public fleet, or with fleets
+from other balena accounts that you may be invited to join under any role.
+For this reason, fleet names are especially discouraged in scripts (e.g. CI
+environments).
+
+Examples:
+
+	balena support enable myorg/myfleet,notmyorg/notmyfleet --duration 3d
+	balena support disable myorg/myfleet
+
+### Arguments
+
+#### ACTION
+
+enable|disable support access
+
+#### FLEET
+
+comma-separated list (no spaces) of fleet names or slugs (preferred)
+
+### Options
+
+#### -t, --duration DURATION
+
+length of time to enable support for, in (h)ours or (d)ays, e.g. 12h, 2d
+
 ## fleet track-latest
 
 ### Description
diff --git a/src/commands/device/support.ts b/src/commands/device/support.ts
new file mode 100644
index 00000000..74baa810
--- /dev/null
+++ b/src/commands/device/support.ts
@@ -0,0 +1,111 @@
+/**
+ * @license
+ * Copyright 2016-2020 Balena Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Flags, Args, Command } from '@oclif/core';
+import { ExpectedError } from '../../errors';
+import * as cf from '../../utils/common-flags';
+import { getBalenaSdk, getCliUx, stripIndent } from '../../utils/lazy';
+
+export default class DeviceSupportCmd extends Command {
+	public static description = stripIndent`
+		Grant or revoke support access for devices.
+
+		Grant or revoke balena support agent access to devices
+		on balenaCloud. (This command does not apply to openBalena.)
+		Access will be automatically revoked once the specified duration has elapsed.
+
+		Duration defaults to 24h, but can be specified using --duration flag in days
+		or hours, e.g. '12h', '2d'.
+
+		Multiple values can specified as a comma-separated list (with no spaces).
+	`;
+
+	public static examples = [
+		'balena support enable ab346f,cd457a --duration 3d',
+		'balena support disable ab346f,cd457a',
+	];
+
+	public static args = {
+		action: Args.string({
+			description: 'enable|disable support access',
+			options: ['enable', 'disable'],
+			required: true,
+		}),
+		uuid: Args.string({
+			description:
+				'comma-separated list (no blank spaces) of device UUIDs to be moved',
+			required: true,
+		}),
+	};
+
+	public static flags = {
+		duration: Flags.string({
+			description:
+				'length of time to enable support for, in (h)ours or (d)ays, e.g. 12h, 2d',
+			char: 't',
+		}),
+		help: cf.help,
+	};
+
+	public static authenticated = true;
+
+	public async run() {
+		const { args: params, flags: options } = await this.parse(DeviceSupportCmd);
+
+		const balena = getBalenaSdk();
+		const ux = getCliUx();
+
+		const enabling = params.action === 'enable';
+
+		if (options.duration != null && !enabling) {
+			throw new ExpectedError(
+				'--duration option is only applicable when enabling support',
+			);
+		}
+
+		// Calculate expiry ts
+		const durationDefault = '24h';
+		const duration = options.duration || durationDefault;
+		const { parseDuration } = await import('../../utils/helpers');
+		const expiryTs = Date.now() + parseDuration(duration);
+
+		const deviceUuids = params.uuid?.split(',') || [];
+
+		const enablingMessage = 'Enabling support access for';
+		const disablingMessage = 'Disabling support access for';
+
+		// Process devices
+		for (const deviceUuid of deviceUuids) {
+			if (enabling) {
+				ux.action.start(`${enablingMessage} device ${deviceUuid}`);
+				await balena.models.device.grantSupportAccess(deviceUuid, expiryTs);
+			} else if (params.action === 'disable') {
+				ux.action.start(`${disablingMessage} device ${deviceUuid}`);
+				await balena.models.device.revokeSupportAccess(deviceUuid);
+			}
+			ux.action.stop();
+		}
+
+		if (enabling) {
+			console.log(
+				`Access has been granted for ${duration}, expiring ${new Date(
+					expiryTs,
+				).toISOString()}`,
+			);
+		}
+	}
+}
diff --git a/src/commands/fleet/support.ts b/src/commands/fleet/support.ts
new file mode 100644
index 00000000..b28d39f3
--- /dev/null
+++ b/src/commands/fleet/support.ts
@@ -0,0 +1,117 @@
+/**
+ * @license
+ * Copyright 2016-2020 Balena Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Flags, Args, Command } from '@oclif/core';
+import { ExpectedError } from '../../errors';
+import * as cf from '../../utils/common-flags';
+import { getBalenaSdk, getCliUx, stripIndent } from '../../utils/lazy';
+import { applicationIdInfo } from '../../utils/messages';
+
+export default class FleetSupportCmd extends Command {
+	public static description = stripIndent`
+		Grant or revoke support access for fleets.
+
+		Grant or revoke balena support agent access to fleets
+		on balenaCloud. (This command does not apply to openBalena.)
+		Access will be automatically revoked once the specified duration has elapsed.
+
+		Duration defaults to 24h, but can be specified using --duration flag in days
+		or hours, e.g. '12h', '2d'.
+
+		Multiple values can specified as a comma-separated list (with no spaces).
+
+		${applicationIdInfo.split('\n').join('\n\t\t')}
+	`;
+
+	public static examples = [
+		'balena support enable myorg/myfleet,notmyorg/notmyfleet --duration 3d',
+		'balena support disable myorg/myfleet',
+	];
+
+	public static args = {
+		action: Args.string({
+			description: 'enable|disable support access',
+			options: ['enable', 'disable'],
+			required: true,
+		}),
+		fleet: Args.string({
+			description:
+				'comma-separated list (no spaces) of fleet names or slugs (preferred)',
+			required: true,
+		}),
+	};
+
+	public static flags = {
+		duration: Flags.string({
+			description:
+				'length of time to enable support for, in (h)ours or (d)ays, e.g. 12h, 2d',
+			char: 't',
+		}),
+		help: cf.help,
+	};
+
+	public static authenticated = true;
+
+	public async run() {
+		const { args: params, flags: options } = await this.parse(FleetSupportCmd);
+
+		const balena = getBalenaSdk();
+		const ux = getCliUx();
+
+		const enabling = params.action === 'enable';
+
+		if (options.duration != null && !enabling) {
+			throw new ExpectedError(
+				'--duration option is only applicable when enabling support',
+			);
+		}
+
+		// Calculate expiry ts
+		const durationDefault = '24h';
+		const duration = options.duration || durationDefault;
+		const { parseDuration } = await import('../../utils/helpers');
+		const expiryTs = Date.now() + parseDuration(duration);
+
+		const appNames = params.fleet?.split(',') || [];
+
+		const enablingMessage = 'Enabling support access for';
+		const disablingMessage = 'Disabling support access for';
+
+		const { getFleetSlug } = await import('../../utils/sdk');
+
+		// Process applications
+		for (const appName of appNames) {
+			const slug = await getFleetSlug(balena, appName);
+			if (enabling) {
+				ux.action.start(`${enablingMessage} fleet ${slug}`);
+				await balena.models.application.grantSupportAccess(slug, expiryTs);
+			} else if (params.action === 'disable') {
+				ux.action.start(`${disablingMessage} fleet ${slug}`);
+				await balena.models.application.revokeSupportAccess(slug);
+			}
+			ux.action.stop();
+		}
+
+		if (enabling) {
+			console.log(
+				`Access has been granted for ${duration}, expiring ${new Date(
+					expiryTs,
+				).toISOString()}`,
+			);
+		}
+	}
+}
diff --git a/src/utils/helpers.ts b/src/utils/helpers.ts
index f44b4515..b4e4fb1b 100644
--- a/src/utils/helpers.ts
+++ b/src/utils/helpers.ts
@@ -21,6 +21,7 @@ import * as _ from 'lodash';
 import { promisify } from 'util';
 
 import { getBalenaSdk, getChalk, getVisuals } from './lazy';
+import { ExpectedError } from '../errors';
 
 export function getGroupDefaults(group: {
 	options: Array<{ name: string; default: string | number }>;
@@ -478,3 +479,25 @@ export function pickAndRename<T extends Dictionary<any>>(
 	});
 	return _.mapKeys(_.pick(obj, fields), (_val, key) => rename[key]);
 }
+
+export const parseDuration = (duration: string) => {
+	const parseErrorMsg =
+		'Duration must be specified as number followed by h or d, e.g. 24h, 1d';
+	const unit = duration.slice(duration.length - 1);
+	const amount = Number(duration.substring(0, duration.length - 1));
+
+	if (isNaN(amount)) {
+		throw new ExpectedError(parseErrorMsg);
+	}
+
+	let durationMs;
+	if (['h', 'H'].includes(unit)) {
+		durationMs = amount * 60 * 60 * 1000;
+	} else if (['d', 'D'].includes(unit)) {
+		durationMs = amount * 24 * 60 * 60 * 1000;
+	} else {
+		throw new ExpectedError(parseErrorMsg);
+	}
+
+	return durationMs;
+};