Datin Paduka Hajah Zasia binti Sirin (born 24 September 1956) is a Bruneian former politician. In 2011 she was one of the first two women appointed to the Legislative Council (LegCo), serving as a member until 2016.

Zasia was born in Brunei in 1956.^[1] She earned a BA and an MA in Islamic studies at Al-Azhar University in Egypt.^[1] After returning to Brunei, she entered the civil service in 1980, initially working as a religious officer in three schools.^[1][2] She gained another master's degree in Islamic Studies (Dakwah and Leadership) from the National University of Malaysia,^[2] and served as director of the Islamic Dakwah Center from 2004 to 2006,^[1] She was also Head of Policy, Planning and Research at the Ministry of Religious Affairs.

On 31 May 2011 Zasia was appointed to the Legislative Council as a representative of 'people who have achieved excellence', taking office the following day.^[3] She and Salbiah binti Sulaiman were the first female members of the LegCo.^[4]

Zasia has received the following awards and honours:^[5]

• 2022 Meritorious Teacher Award^[6]

• Order of Seri Paduka Mahkota Brunei Second Class (DPMB) – Datin Paduka
• Order of Islam Brunei Third Class (SSUB)
• Excellent Service Medal (PIKB)