According to the UK-based Bahrain Institute for Rights and Democracy (BIRD), 16 Bahrainis are currently awaiting execution in the Persian Gulf kingdom.
The rights group alleges that 13 were convicted of politically motivated charges; nine of them this year.
On January 15, Manama executed three Shiite men in what marked the first death sentences to be carried in decades.
Sami Mushaima, Ali Al-Singace, and Abbas Al-Samea were killed by firing squad after being falsely accused of carrying out a bombing in 2014 that left three state-security officers dead. They were convicted despite having their confessions extracted under torture, a lack of evidence, and the absence of due process.
This year is the 15th World Day Against the Death Penalty, which falls on October 10 and seeks the abolition of the practice.