Maharani Ayilyom Thirunal Gouri Lakshmi Bayi (1791–1815) was the Maharani of the Indian state of Travancore from 1810 till 1813 and Regent from 1813 till her death in 1815 for her son Swathi Thirunal Rama Varma. She was the only Queen of Travancore to have reigned in her own right for two years before becoming a regent.

Gouri Lakshmi Bayi was born in the year 1791 to Princess Attham Thirunal, Senior Rani of Attingal of the Travancore Royal Family, adopted sister of Maharajah Balarama Varma. Attham Thirunal was adopted into the Travancore family from Kolathunad in 1788. The Maharanis of Travancore were styled as the "Ranis of Attingal". Gowri Lakshmi Bayi was one of Travancores most popular Queens and introduced several reforms in the state.

The unpopular Maharajah Bala Rama Varma, during whose reign Travancore faced a number of internal and external problems, revolts and unnecessary battles and conspiracies, including the most important revolt of Velu Thampi Dalawa, died in 1811. At the death of the Maharajah, Gowri Lakshmi Bayi, the senior Rani of Attingal, was barely twenty years of age. There were no eligible male members in the family which meant she would have to take over Travancore and rule it as regent till such an heir would be born to her. However her accession was not easy because a member from the Mavelikara branch of Royal family, a distant cousin, Prince Kerala Varma, who was the pet of the previous ruler, staked a claim on the throne which was anything but substantiated. The Princess placed in the hands of the British Resident Col. John Munro, one of Travancore's most loved British Residents, a document asserting her claim and proving the claim of Kerala Varma untenable. This irked Kerala Varma who resorted to tact and tried to convince the Princess to give up her claim. However the Resident sided with Gowri Lakshmi Bayi and she was made the Regent Maharani of Travancore in 1811. Kerala Varma was permitted to reside at Trivandrum, the capital; but when he tried to create further troubles, he was imprisoned and banished from Travancore.

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