| Lazar Tomanović | |
| Office: | 5th Prime Minister of Principality of Montenegro 4th president of the Ministerial Council of Principality of Montenegro |
| Native Name Lang: | cnr |
| Predecessor: | Andrija Radović |
| Successor: | Mitar Martinović |
| Termend: | 28 August 1910 |
| Termstart: | 17 April 1907 |
| Party: | Independent |
| Birth Date: | 3 September 1845 |
| Birth Place: | Lepetane, Herceg Novi, Dalmatia, Austrian Empire |
| Death Place: | Jošice, Herceg Novi, Zeta Banovina, Yugoslavia |
| Nationality: | Montenegrin, Yugoslav |
| Office2: | 1st Prime Minister of Kingdom of Montenegro 1st president of the Ministerial Council of Kingdom of Montenegro |
| Monarch2: | Nicholas I |
| Office3: | 7th Minister of Internal Affairs of Principality of Montenegro |
| Office4: | 9th and 12th Minister of Justice of Principality of Montenegro |
| Office6: | 1st Minister of Justice of Kingdom of Montenegro |
| Office7: | 6th Minister of Foreign Affairs of Principality of Montenegro |
| Office8: | 1st Minister of Foreign Affairs of Kingdom of Montenegro |
| Predecessor3: | Jovan Plamenac |
| Predecessor4: | Gavrilo M. Cerovic |
| Predecessor5: | Baina Vucković |
| Predecessor6: | Himself (as Minister of Justice of Principality of Montenegro) |
| Predecessor7: | Andrija Radović |
| Predecessor8: | Himself (as Minister of Foreign Affairs of Kingdom of Montenegro) |
| Successor3: | Jovan Plamenac |
| Successor4: | Sekula Drljević |
| Successor5: | Himself (as Minister of Justice of Kingdom of Montenegro) |
| Successor6: | Milo Dožić |
| Successor7: | Himself (as Minister of Foreign Affairs of Kingdom of Montenegro) |
| Successor8: | Dušan Gregović |
| Termend3: | 6 February 1910 |
| Termend4: | 15 May 1909 |
| Termend5: | 28 August 1910 |
| Termend6: | 24 August 1911 |
| Termend7: | 28 August 1910 |
| Termend8: | 24 August 1911 |
| Termstart3: | 15 April 1909 |
| Termstart4: | 17 May 1907 |
| Termstart5: | 13 April 1910 |
| Termstart6: | 28 August 1910 |
| Termstart7: | 17 April 1907 |
| Termstart8: | 28 August 1910 |
| Successor2: | Mitar Martinović |
| Predecessor2: | Himself (as Prime Minister or Principality of Montenegro) |
| Termend2: | 19 July 1912 |
| Termstart2: | 28 August 1910 |
| Monarch3: | Nicholas I |
| Monarch4: | Nicholas I |
| Monarch5: | Nicholas I |
| Monarch6: | Nicholas I |
| Monarch7: | Nicholas I |
| Monarch8: | Nicholas I |
| Primeminister3: | Himself |
| Primeminister4: | Himself |
| Primeminister5: | Himself |
| Primeminister6: | Himself |
| Primeminister7: | Himself |
| Primeminister8: | Himself |
Lazar Tomanović, PhD (; 3 September 1845 – 2 November 1932) was a Montenegrin and Dalmatian Serb writer, politician and diplomat, who served as the fifth Prime Minister of Montenegro, as well the first Prime Minister of the Kingdom of Montenegro, under the regime of King Nikola I.
Lazar Tomanović was born on 3 September 1845 in Lepetane, a village near Herceg Novi in Bay of Kotor. At the time it was part of the Kingdom of Dalmatia within the Austrian Empire. Having finished elementary and secondary school in Herceg Novi, Tomanović studied in Novi Sad and Budapest and received his doctorate in law in Graz. He was a member of Parliament of Dalmatia (Diet) as representative of Serb People's Party in the Kingdom of Dalmatia.
He became Prime Minister of Montenegro with support of Royalist True People's Party in April 1907 and held the office for several terms until June 1912. He also served Minister of Foreign Affairs and Minister of Justice of Montenegro. During his second term, Montenegro was proclaimed a sovereign kingdom.[1] [2]