Jai Singh Prabhakar

{{Short description|Maharaja of Alwar from 1882–1937}}

{{Use dmy dates|date=October 2018}}

{{Use Indian English|date=October 2018}}

{{Infobox royalty

| name = HH Maharaja Sir Jai Singh

| title = Maharaja of Alwar

| image = Maharaja Jai Singh of Alwar State.jpg

| reign = 1892 to 1937

| coronation = 3 June 1892

| succession = Ruler of Alwar

| predecessor = Mangal Singh Prabhakar

| successor = Tej Singh Prabhakar

| spouse = HH Maharaniji Sa Rathorji Shri Sugan Kanwarji d.of HH Umda-e-Raja-e-Buland Makan Maharajadhiraj Maharaja Sir Sardul Singh of Kishangarh State

HH Maharaniji Sa Jadejiji Janak Kanwarji Saheba d.of Thakore Balsinhji of Khirasra in Dhrol State

HH Maharaniji Sa Jadejiji Shri Prabhat Kanwarji Saheba of Rajpur in Jamnagar State

HH Maharaniji Sa Jhaliji Shri Jayendra Kanwarji Saheba of Dhuva in Wankaner State

| issue = Maharajkumariji Baiji Lal Shri Taj Kanwarji Saheba m.to HH Maharaja Krishna Singh Ju Deo Lokendra Bahadur of Datia State

| royal house = Naruka Kachwaha

| father = Sir Mangal Singh Prabhakar Bahadur

| mother = HH Maharaniji Sa Rathorji Shri Kishan Kanwarji Saheba d.of Maharaja Bhairon Singh of Ratlam State

| birth_date = {{Birth date|1882|6|14|df=yes}}

| birth_place = City Palace, Alwar, Alwar State, Rajputana

| death_date = {{Death date and age|1937|5|20|1882|6|14|df=yes}}

| death_place = Paris, France|

}}

Hon Colonel. HH Raj Rajeshwar Bharat Dharma Prabhakar Maharaja Shri Sawai Sir Jai Singhji Veerendra Shiromani Dev Bahadur {{post-nominals|country=GBR|GCSI|GCIE}}, or simply Jai Singh Prabhakar, (14 June 1882 – 19 May 1937), was the Naruka Kachwaha Rajput ruler of the Princely State of Alwar from the year 1892 to 1937. The only son of the previous ruler, Sir Mangal Singh Prabhakar Bahadur, Sir Jai Singh initially was noted as brilliant, erudite and charming. However, he was later forced into exile. He died in 1937 at the age of 54. He was succeeded by a distant relative, Tej Singh Prabhakar Bahadur.

He was educated in the prestigious Mayo College, Ajmer, in which his late father was the first to take admission. He was highly regarded an absolute Indian English orator and scholar. He assisted the farming community with the construction of a number of bunds (irrigation dams).{{cite web |url=http://www.indiaofthepast.org/contribute-memories/read-contributions/life-back-then/535-the-rise-and-fall-of-the-princely-state-of-alwar |title=The Rise and Fall of the Princely State of Alwar |website=www.indiaofthepast.org |url-status=dead |archive-url=https://web.archive.org/web/20170425064648/http://www.indiaofthepast.org/contribute-memories/read-contributions/life-back-then/535-the-rise-and-fall-of-the-princely-state-of-alwar |archive-date=2017-04-25}}