Hayley Woo is a Singaporean actress. She was managed by JTeam JM Artiste Network from 2013 to 2017. She has an identical twin sister, Jayley Woo, who is also an actress. Woo was a blogger alongside her younger twin sister, Jayley Woo under the stage name Jay On The Hay. Woo has an official fan club called "Hayleycopters".

In 2013, she starred in a Malaysian production called Dive Into Love & The Recruit Diaries.

In 2014, she started her debut drama as a supporting role in Zero Calling Three Wishes.

In 2015, she appeared in more MediaCorp Channel 8 productions like 118, Crescendo and Zero Calling 2. She was also involved in a Starhub local production titled My Secret App.

In 2016, she filmed a series If Only I Could, a Wawa production called Fire Up and a long form drama 118 II.

In 2017, she filmed a Toggle series with Jeremy Chan called Hear My Thoughts and a drama series Doppelganger. She was also involved in Life Less Ordinary where she played sisters with her real life twin sister Jayley Woo and it is her first villain role.