Tej Singh or Teja Singh was a Sikh commander in the Sikh Empire. He was appointed as Commander in chief of the SikhKhalsa Army during the First Anglo-Sikh War.
Tej Singh was the nephew of Jamadar Kushal Singh, a Hindu from Meerut, who arrived in the court of Maharaja Ranjit Singh. Both Kushal Singh and Tej Singh converted to Sikhism. While Kushan Singh became the Chamberlain for the Maharaja, Tej Singh enrolled in the army and rose to the rank of a general.
After the death of Maharaja Ranjit Singh, the Sikh court became fractious and the various agents acted at cross purposes to each other. Tej Singh appears to have had loyalties to the Raja Gulab Singh of Jammu and he, along with Gulab Singh, believed it to be a mistake to be warring with the British. However, Rani Jindan, the Regent acting on behalf of the anointed prince Duleep Singh, ordered him to march the troops against the British. He did so reluctantly.
In the Battle of Sobraon, General Tej Singh crossed the pontoon bridge linking the two flanks of the Sutlej river and ordered its destruction. According to historian Amar Pal Sidhu, this incident led to the defeat of the Sikh Army.