Stanislav "Staško" Sondermajer (5 September 1898 – 5 August 1914) was the youngest Serbian soldier killed at the beginning of the First World War during the Battle of Cer; he died on the battlefield at the age of 15.

He was the youngest of the Sondermayer family, son of surgeon Colonel Dr Roman Sondermajer, founder and director of the Serbian Army Medical Service, and of Stanislava Đurić Sondermayer, volunteer nurse in both Balkan wars, daughter of General Dimitrije Đurić and grand-daughter of Dimitrije Matić.

Stanislav ran away from home to the border, he was taken in by a local volunteer group somewhere near Šabac; an experienced rider, he managed to enter the service in the Third Cavalry Regiment on July 16 under the command of Colonel Peter Savatic.

[2] He participated in the Battle of Cer where he was fatally wounded on August 5, during a charge on the Austro-Hungarian corps near the village of Dobrić, exactly one month before his sixteenth birthday.

Isidora Sekulić wrote the song Tihestrofe, dedicated to Stanislav Sondermajer, while Historian prof. Miodrag Ibrovac, who was also his classmate, wrote: A heartfelt regret, young, and so famous, the little hero of the Third Cavalry Regiment is living an eternal dream in the field of honour.On August 5, 2011, the remains of Stanislav were reburied in Bogosavac, after a memorial prayer service.