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 March 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 GLOBAL ENERGY S.L.U. | Spain | 100% |
| HOCOL PETROLEUM LIMITED | Bermuda | 100% |
| BIOENERGY S.A.S.** | Colombia | 99.60% |
| BIOENERGY ZONA FRANCA S.A.S.** | Colombia | 99.60% |
| ESENTTIA MASTERBATCH LTDA** | Colombia | 100% |
| ECOPETROL AMERICA LLC** | United States | 100% |
| ECOPETROL PERMIAN LLC** | United States | 100% |
| ECOPETROL USA INC** | United States | 100% |
| ECOPETROL DEL PERU S.A.** | Peru | 100% |
| ECOPETROL OLEO & GAS DO BRASIL LTDA** | Brazil | 100% |
| ECP OIL AND GAS GERMANY GMBH** | Germany | 100% |
| HOCOL S.A.** | Cayman Islands | 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% |
| REFINERIA DE CARTAGENA S.A.S ** | Colombia | 100% |
| ESENTTIA S.A. ** | Colombia | 100% |
| ESENTTIA RESINAS DEL PERU SAC** | Peru | 100% |
| ECP Hidrocarburos de México ** | Mexico | 100% |
| KALIXPAN SERVICIOS TÉCNICOS S. de r.l. de c.v** | Mexico | 100% |
| TOPILI SERVICIOS ADMINISTRATIVOS** de r.l. de c.v | Mexico | 100% |
| ECOPETROL ENERGÍA SAS ESP ** | Colombia | 100% |
| INVERSIONES GASES DE COLOMBIA S.A. | Colombia | 51.87% |
| ECOPETROL COSTA AFUERA COLOMBIA S.A.S.** | Colombia | 100% |
*Direct and/or indirect participation.
**Solely indirect participation through subsidiaries or affiliates.