| Onambalam | |
| Settlement Type: | Village |
| Pushpin Map Caption: | Location in Kerala, India |
| Coordinates: | 8.998°N 76.6688°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Kerala |
| Subdivision Type2: | District |
| Subdivision Name2: | Kollam |
| Unit Pref: | Metric |
| Elevation M: | 4 |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Malayalam, English |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | PIN |
| Postal Code: | 691 503 |
| Area Code Type: | Telephone code |
| Area Code: | 0474 |
Onambalam is a small inland fishing and trading harbour in Kumbalam, Kollam, India on the shore of Ashtamudi lake. With improvements in road transport its prominence has reduced after 1980s and now it is used as a fish market and a harbour for small inland fishing vessels. A boat race was organized from here during 28th day of Onam every year in the past but has not been conducted in recent years.
The harbour land is owned by St. Michael's Church and features a grotto of Mother Mary; a scenic view of Ashtamudi lake is possible from here.
The name Onambalam is derived from two Malayalam words: (—one) and (—temple). The area got its name since it is one mile away from Chittumala Durga Devi Temple. It was an important coir and cashew trading centre, and there was boat service to Kollam originating here. As inland water transport lost prominence the harbour was abandoned, but certain steps are made to improve inland navigation. A new boat jetty was built by Kollam District Tourism Promotion Council and District Panchayat. A shrine to Our lady Help of Christians is situated in Onambalam Landing Centre, built by Salesians of Donbosco priests who served in Kumbalam parish. Onambalam is a tourism destination near Kollam Technopark located in Kundara. The nearest railway station is Kundara, which is 13km (08miles) from Kollam. Onambalam can be reached by road from Kundara or Chittumala.
A new small boat jetty has been constructed here as part of the Ashtamudi Tourism Circuit.