"Work is Worship" ("Karam Hi Dharam" in Hindi, literally "Religious duty through action") is used frequently in India as well as other Hindu communities. It is the motto of the Bihar Regiment of the Indian Army and of many schools in India. There's even been a movie made with this title.
It represents the philosophical and religious belief of "Karam Hi Dharam" or "Karma Yoga" which is one of the avenues to attaining Moksha, the Hindu belief of becoming one with the Universal Consciousness. The other two being Devotion (Bhakti Yoga) and Knowledge (Jnana Yoga).
At the core of Karma Yoga is the understanding that all needful work done well is a reflection of the God and there is no such thing as "menial" work as long as it is done to the best of your abilities. Work is a means of realizing the God and is a form of praise, service, repentance and atonement though which one can eliminate their karma and be liberated from the wheel of reincarnation.