GVY: To Hanuman, for love of selfless service

Aum Anjaneyaye VidmaheMahabalaye DhimahiTanno Hanuman Prachodayat

Another similar Gayatri for Hanuman is:

Aum anjani sutaya cha vidmaheVayu putraya cha dhimahiTanno marutih prachodayat

Translation:

“Om. Let us meditate on Sri Hanuman, whose mother is Anjani Devi. May that supremely brave and strong Maruti, son of the Wind god, inspire and illumine our mind and understanding.”