Si is a 2014 novel by writer published by Visprint Inc. It is Ong's tenth book. The novel, set in order, is told from the point of view of an unnamed narrator and his love affair with his wife, Victoria.

According to Ong, the book is "a story of love, not romance and relationships. It is about our capacity, opportunity, responsibities and right to fall in love."

About the Author

Bob Ong, or Roberto Ong, is the pseudonym of a Filipino contemporary author known for using conversational Filipino to create humorous and reflective depictions of life as a Filipino.

One reviewer notes (translated from the vernacular):
"Filipinos really patronize Bob Ong's works because, while most of his books may have an element of comedy in them, this is presented in a manner that replicates Filipino culture and traditions. This is likely the reason why his first book - and those that followed it, can be considered true Pinoy classics."

The six books he has published thus far have surpassed a quarter of a million copies.