Om Sarve Bhavantu Sukhinah is a very popular peace mantra in Sanskrit. The original author of this popular Sanskrit mantra is unknown, however, similar sloka can be found in Garuda Purana, Asirvacanam 2 of itihāsa Samuccaya and Uvaṭa’s Mantrabhāṣya of Vājasaneya Saṁhitā or Śuklayajurveda Samhitā.

सर्वेषां मङ्गलं भूयात् सर्वे सन्तु निरामयाः।
सर्वे भद्राणि पश्यन्तु मा कश्चिद्दुःखभाग् भवेत्।।

sarveṣāṁ maṅgalaṁ bhūyāt sarve santu nirāmayāḥ|
sarve bhadrāṇi paśyantu mā kaścidduḥkhabhāg bhavet||

– Garuda Purana 35.51

सर्वे कुशलिनः सन्तु सर्वे सन्तु निराम्याः।
सर्वे भद्राणि पश्यन्तु मा कश्चिद्दुःखभाग् भवेत्।।

sarve kuśalinaḥ santu sarve santu nirāmyāḥ|
sarve bhadrāṇi paśyantu mā kaścidduḥkhabhāg bhavet||

– Itihasa Samuccaya

शुभं भवतु पाठकलेखकयोः। शिवमस्तु सर्वजगतः।
सर्वे भवन्तु सुखिनः सर्वे सन्तु निरामयाः।
सर्वे भद्राणि पश्यन्तु मा कश्चित्कष्टमाप्नुयात्।।

śubhaṁ bhavatu pāṭhakalekhakayoḥ| śivamastu sarvajagataḥ|
sarve bhavantu sukhinaḥ sarve santu nirāmayāḥ|
sarve bhadrāṇi paśyantu mā kaścitkaṣṭamāpnuyāt||

Vājasaneya Samhitā.

The current form of the mantra, popularly known as Om Sarve Bhavantu Sukhinah mantra may have been originated during the second half of the 11th century CE.

Om Sarve Bhavantu Sukhinah-mantra

In Sanskrit

ॐ सर्वे भवन्तु सुखिनः
सर्वे सन्तु निरामयाः ।
सर्वे भद्राणि पश्यन्तु
मा कश्चिद्दुःखभाग्भवेत् ।
ॐ शान्तिः शान्तिः शान्तिः ॥

In English

Om Sarve Bhavantu Sukhinah
Sarve Santu Niraamayaah |
Sarve Bhadraanni Pashyantu
Maa Kashcid-Duhkha-Bhaag-Bhavet |
Om Shaantih Shaantih Shaantih ||

Meaning:

Om, May All be Prosperous and Happy,
May All be Free from Illness.
May All See what is Auspicious,
May no one Suffer.
Om Peace, Peace, Peace.

(Last Updated On: October 4, 2020)