Exhibit 8.1
Subsidiaries of Ecopetrol S.A.
The following table sets forth our subsidiaries, their respective countries of incorporation, our percentage ownership in each (both directly and indirectly through other subsidiaries) at December 31, 2020.
| COMPANY | COUNTRY OF INCORPORATION | OWNERSHIP |
| ANDEAN CHEMICALS LIMITED | Bermuda | 100% |
| BLACK GOLD RE LIMITED | Bermuda | 100% |
| CENIT TRANSPORTE Y LOGÍSTICA DE HIDROCARBUROS S.A.S. | Colombia | 100% |
| ECOPETROL CAPITAL AG | Switzerland | 100% |
| ECOPETROL ENERGÍA SAS ESP * | Colombia | 100% |
| ECOPETROL GLOBAL ENERGY S.L.U. | Spain | 100% |
| EQUION ENERGÍA LIMITED | United Kingdom | 51% |
| HOCOL PETROLEUM LIMITED | Bermuda | 100% |
| INVERSIONES DE GASES DE COLOMBIA S.A. - Invercolsa S.A. | Colombia | 51.88% |
| REFINERIA DE CARTAGENA S.A.S * | Colombia | 100% |
| COLOMBIA PIPELINES LIMITED** | United Kingdom | 51% |
| ECOPETROL AMERICA LLC** | United States | 100% |
| ECOPETROL COSTA AFUERA COLOMBIA S.A.S.** | Colombia | 100% |
| ECOPETROL DEL PERU S.A.** | Peru | 100% |
| ECOPETROL OLEO & GAS DO BRASIL LTDA** | Brazil | 100% |
| ECOPETROL PERMIAN LLC ** | United States | 100% |
| ECOPETROL USA INC ** | United States | 100% |
| ECP Hidrocarburos de México ** | Mexico | 100% |
| ESENTTIA MASTERBATCH LTDA** | Colombia | 100% |
| ESENTTIA RESINAS DEL PERU SAC** | Peru | 100% |
| ESENTTIA S.A. * | Colombia | 100% |
| HOCOL S.A.** | Cayman Islands | 100% |
| KALIXPAN SERVICIOS TÉCNICOS S. de r.l. de c.v ** | Mexico | 100% |
| OLEODUCTO BICENTENARIO DE COLOMBIA S.A.S.** | Colombia | 55.97% |
| OLEODUCTO CENTRAL S.A. - OCENSA** | Colombia | 72.65% |
| OLEODUCTO DE COLOMBIA S.A. - ODC ** | Colombia | 73% |
| OLEODUCTO DE LOS LLANOS ORIENTALES S.A.** | Panama | 65% |
| SANTIAGO OIL COMPANY** | Cayman Islands | 51% |
| TOPILI SERVICIOS ADMINISTRATIVOS de r.l. de c.v** | Mexico | 100% |
*Direct and/or indirect participation.
**Solely indirect participation through subsidiaries or affiliates.