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Atmospheric CO2variability on the glacial–interglacial (G–IG) timescale reflects a balance between oceanic and terrestrial processes involving carbon uptake and release. The Southern Ocean CO2uptake is considered as an important modulator for the G–IG atmospheric CO2variability, while the role of tropical ocean ventilation remains enigmatic. We present critical evidence for CO2ventilation from the tropical Indian Ocean through the reconstruction of the Arabian Sea‐surface pCO2for the past ∼136 ka utilizing boron isotope (δ11B) record of planktic foraminifera, Globigerinoides ruber. Our site in the Arabian Sea presently acts as a significant source of CO2. The reconstructed ΔpCO2(ΔpCO2= pCO2 Seawater− pCO2 Atmosphere) record shows an enhanced CO2degassing up to ∼50 ppm during the major cooling events, such as the Last Glacial Maximum, Younger Dryas, and Heinrich‐Stadials. Our investigation based on multiproxy records of sea‐surface temperature, salinity, and productivity suggests that the northward invasion and shoaling of southern source CO2‐rich water, coupled with stronger upwelling, resulted in CO2degassing during these cold intervals. This finding is in align with the tropical Atlantic which also demonstrated an enhanced CO2degassing during the cold intervals; however, most of the upwelled CO2was consumed as the water moved away from the upwelling sites. Therefore, our finding, when considered alongside tropical Atlantic records, suggests that tropical oceans played a minor role in reducing atmospheric CO2levels during the cold intervals of the last glacial cycle, supporting the prevailing hypothesis. Foraminifera δ11B‐based CO2record of Arabian Sea surface for the past ∼136 kaEnhanced CO2degassing during the cold climate events, that is, Heinrich‐Stadials, Younger Dryas, and Last Glacial MaximumThis degassing was caused by more export of southern‐sourced water and its upwelling Foraminifera δ11B‐based CO2record of Arabian Sea surface for the past ∼136 ka Enhanced CO2degassing during the cold climate events, that is, Heinrich‐Stadials, Younger Dryas, and Last Glacial Maximum This degassing was caused by more export of southern‐sourced water and its upwelling