Lalon (Bengali: লালন; died 17 October 1890), also known as Lalon Shah, Lalon Fakir and Shahji, was a Bengali spiritual leader, philosopher, mystic poet and social reformer. Regarded as an icon of Bengali culture, he inspired and influenced many philosophers, poets and social thinkers including Rabindranath Tagore, Kazi Nazrul Islam and Allen Ginsberg. Lalon's philosophy of humanity rejects all distinctions of caste, class, and creed and takes a stand against theological conflicts and racism. It denies all worldly affairs in search of the soul and embodied the socially transformative role of sub-continental Bhakti and Sufism.

Lalon founded the institute known as Lalon Akhra in Cheuriya, about 2 kilometres (1.2 mi) from Kushtia railway station in southwestern Bangladesh. His disciples dwell mostly in Bangladesh and Indian states of West Bengal, Tripura and Assam’s Barak Valley. Every year on the occasion of his death anniversary, thousands of his disciples and followers assemble at Lalon Akhra and pay homage to him through celebration and discussion of his songs and philosophy for three days.

In 2004, Lalon was ranked 12 in BBC's poll of the Greatest Bengali of all time.

Everyone wonders, "What religion does Lalon belong to in this world?"
Lalon says, "What does religion look like?
I've never seen the true color of religion."
Some wear beads as necklace (Hindu rosaries),
others count beads as Tasbih (Muslim rosaries),
and so people say
they belong to a different religion.
But do you bear the sign of your religion
when you come (to this world) or when you leave (this world)?

There are few reliable sources for the details of Lalon's early life as he was reticent in revealing his past. It is not known exactly when, where and how Lalon was born. Lalon had no formal education. Uwe Skoda places his birth to Jhenaidah, Bengal Subah.

Sunil Gangopadhyay related in his book "Moner Manush" that Lalon, during a pilgrimage to the temple of Jagannath with others of his native village, contracted smallpox and was abandoned by his companions on the banks of the Kaliganga River. Malam Shah and his wife Matijan, members of the weaver community in a Muslim-populated village, Cheuriya, found him faint and took him to their home to convalesce. While he was growing up, he found his mentor Siraj Sain, a Baul saint of that village.

Lalon lived within the zamindari of the Tagores in Kushtia and had visited the Tagore family. It is said that zamindar Jyotirindranath Tagore sketched the only portrait of Lalon in 1889 in his houseboat on the river Padma. Lalon died at Chheuriya on 17 October 1890 aged 118. The news of his death was first published in the newspaper Gram Barta Prokashika, run by Kangal Harinath. Lalon was buried at the middle of his dwelling place known as his Akhra. Researchers note that Lalon was a close friend of Kangal Harinath, one of the contemporary social reformers and a disciple of Lalon.

How does the Unknown bird go,
into the cage and out again,
Could I but seize it,
I would put the fetters of my heart,
around its feet.
The cage has eight rooms and nine closed doors;
From time to time fire flares out;.
Above there is a main room,
The mirror-chamber