This is to raise awareness on leukaemia – a type of blood cancer.
The inaugural orange day is the initiative of the Cecilia Ali Leukaemia Foundation (CALF).
CALF has had a few sponsors on board to see to the worthy course.
"It's something we believe in, the values and especially that the funds are going towards raising awareness on blood cancers and helping people living with leukaemia," said Andrew Rumawery from SMEC.
CEO and co-founder of CALF, Christina Cragnolini, says at least 600 people are expected to show up.