Here is the Sanskrit text with English translation.

 

Ganesha
Atharva Sheersha

The Highest
Praise of the Lord of the Ganas.

Om namaste Ganapataye.  Om. Salutations to You, O Lord of the Ganas.

Twameva pratyaksham tattwam-asi. You are the
Manifestation of the Divine Principle

Twameva kevalam kartā-‛si. You alone are the Doer.

Twameva kevalam dhartā-‛si. You alone are
the Supporter and the Sustainer.

Twameva kevalam hartā-‛si. You alone are the Remover and Destroyer.

Twameva sarvam khalv-idam
Brahmāsi. You are everything even indeed the Formless Spirit

Twam sākshād-ātmāsi nityam. You are the Embodiment of the Soul eternally

Ritam-vachmi. Satyam-vachmi. I speak Divine Law. I speak the Truth

Ava twam mām. Protect thou me.

Ava vaktāram. Ava śhrotāram. Be propitious to the speaker and the listener.

Ava dātāram. Ava dhātāram. Watch over the
one who gives and the recieiver.

Av-ān-ūchānam-ava śhishyam. Show favour to the learned scholar and the pupil.

Ava paschāt-tāt. Ava puras-tāt. Protect from behind. Protect from the front.

Av-ottarāt-tāt. Ava
dakshināt-tāt. Protect from the left side. Protect from the right
side.

Ava-chordhvāt-tāt Av-ādharāt-tāt. Protect from above. Protect from below.

Sarvato-mām pāhi-pāhi sam-antāt. From all directions guard and protect me constantly

Twam vāng-mayas-twam chin-mayahª.
You are the Spoken Word and Pure Consciousness.

Twam ānanda-mayas-twam Joy is Your essence.

Brahma-mayahª. Formless Spirit is Your Nature.

Twam
sach-chid-ānand-ādvitīyō-‛si. You are Existence, Consciousness and Joy
unequalled.

Twam pratyaksham Brahmāsi. You are the Supreme Spirit manifested.

Twam gñyāna-mayo
vigñyāna-mayō-‛si. You are all
Knowledge and Understanding

Sarvam jagad-idam twatto jāyate. This whole world is born from You.

Sarvam jagad-idam twattas
tishťhati. This whole world is sustained by You.

Sarvam jagad-idam twayi layam-eshyati. This whole world will dissolve in You.

Sarvam jagad-idam twayi pratyeti.
This whole world returns to You.

Twam bhūmir āpō-‛nalō-‛nilo
nabhah^a You are Earth,
Water, Fire, Air and Ether (5 elements)

Twam chatvāri vāk-padāni. You are the four parts of speech.

Twam guna tray-ātītah^a.
You are beyond the three attributes

Twam deha tray-ātītah^a.
You are beyond the three bodies.

Twam kāla tray-ātītah^a.
You are beyond the three times.

Twam mūlādhāra sťhitō-‛si nityam.
You are eternally stationed at Mooladhara Chakra.

Twam shakti-try-ātmakah^a.
You are the Essence of the three Shaktis.

Twām yogino dhyāyanti nityam. On You Yogis meditate constantly.

Twam Brahmā twam Vishnus-twam. You are Lord
Brahma. You are Shri Vishnu .

Rudras-twam
Indras-twam
You are
Lord Shiva. You are Shri Indra.

Agnis-twam Vāyus-twam You are the God of Fire, You are Lord of the Wind.

Sūryas-twam Chandramās-twam You are the Sun and You are the Moon.

Brahma-bhūr-bhuvah^a
swarom. Supreme Spirit, Earth, Sky, Heaven and Omkāra  

 

Ganādim pūrvam uchchārya.      Saying Ganas
first letter (G) at the beginning,

Varnādim tad-anantaram. The first letter of the alphabet (A) next.

Anu-swārah^a para-tarah^a.
And the nasal sound (M) after that.

Ardhendu lasitam. Tārena riddham.
      The crescent
resounding, completed with the Om.

Etat-tava manu swa-rūpam. This is the true form of Your mantra.

Gakārah^a pūrva rūpam. ‘G’ is the first form.

Akāro madhyama rūpam ‘A’ is the middle form.

Anuswārash chāntya rūpam. And ‘M’ is the
last form

Bindur uttara rūpam. Bindu (dot) is the finishing form on top

Nādah^a samdhānam.
Samhitā sandhihⁱ. With the sounds united according to Sandhi.                           

Saishā Ganesha-vidyā. In this manner, is the knowledge of Shri Ganesha.

Ganaka rishihⁱ. The seer is sage Ganaka.

Nichrid gāyatrī chhandah^a.
The metre is a mixed Gāyatrī.

Ganapatir devatā. The presiding Deity is Shri Ganapati.

Om Gam Ganapataye namah^a.    ‘Om Gam’,
obeisance to the Lord of the Ganas

 

Eka-dantāya vidmahe. We have the knowledge of the One-Tusked God.

Vakra-tundāya dhī-mahi. We meditate on the Lord with a Curved Trunk ,

Tanno dantī prachodayāt. May the Ivoried God inspire and stimulate us

 

Eka-dantam chatur-hastam One-tusked and four-handed

Pāśham ankuśha dhārinam. Wielder of the noose and elephant goad.

Radam cha varadam hastair bibhrānam Holding a broken tusk and all blessings in the hands

Mūshaka dhvajam Having a mouse as an emblem.

Raktam, lambodaram Red-coloured, with a big belly,

Śhūrpa karnakam, rakta-vāsasam. Ears like winnowing fans and clothed in red.

Rakta gandh-ānu-liptāngam With fragrant red sandalwood paste anointing the body.

Rakta pushpaihⁱ
su-pūjitam. Auspiciously worshipped with red flowers.

Bhakt-ānu-kampinam devam      The God who is
Compassionate to devotees,

Jagat kāranam achyutam. The Imperishable Origin of the world,

Āvir-bhūtam cha srishty-ādau And becoming manifest at the beginning of creation.

Prakriteh^e purushāt param. Being beyond the Ādi Shakti and the Supreme Spirit.

Evam dhyāyati yo nityam. Whoever meditates in this way constantly,

Sa yogī yoginām varah^a.
That Yogi becomes the most
excellent of Yogis.

Namo vrāta-pataye. Namo
gana-pataye. We bow to the Lord of Assemblies and Chief of Ganas

Namah^a
pramaťha-pataye. Prostrations to the Leader of Lord Shiva’s hordes,

Namastē-stu
lambodarāy-aika-dantāya Let there be
obeisance to the Big-bellied, One-toothed

Vighna nāśhine Śhiva sutāya Destroyer of Obstacles, the Son of Lord Shiva

Śhrī varada  mūrtaye namo namah^a. To the Embodiment of the Giver of prosperity and boons, Salutations again
and again.

 

Sākshāt  Śhrī 
Ādi  Śhakti  Mātājī 
Śhrī  Nirmalā  Devyai namo namah^a 

Who art in reality the Holy Primordial Energy,
Divine Mother,

To the Immaculate Goddess,
salutations again and again