Ottomar Ladva (born 17 June 1997) is an Estonian chess player and grandmaster.

[5] Ladva won the Estonian Junior Chess Championships (U18) in 2010, 2012, 2013 and 2014.

In the Estonian Chess Championship, he has won four gold (2013, 2015, 2016, 2018) and one silver (2014) medals.

[7] He became the youngest Estonian champion at age 15, when he beat Lembit Oll's (1982) record.

In June 2015, he won a round-robin tournament in Riga finalised to get a Grandmaster norm.