Building a retirement portfolio is about reliability, resilience, and the ability to generate income over time. The right mix of ASX shares can provide steady cash flow while still offering modest growth to keep up with inflation.
With that in mind, here are three ASX shares that could help form a winning retirement portfolio.

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APA Group (ASX: APA)
The first ASX share to consider is APA Group.
It is a major player in Australia's energy infrastructure sector, operating gas pipelines and related assets across the country.
What makes APA attractive for a retirement portfolio is the nature of its income. Much of its revenue is generated through long-term contracts, which can provide a high level of visibility and stability.
This supports consistent distributions, making it a popular choice among income-focused investors.
While its growth may not be rapid, the predictability of cash flow is a key strength. It also handily offers a forecast dividend yield near 6%.
Transurban Group (ASX: TCL)
Another ASX share that could be worth considering is Transurban Group.
It owns and operates toll roads in Australia and North America, providing essential infrastructure that is used daily. This includes CityLink and West Gate Tunnel in Melbourne and the Cross City Tunnel and the Eastern Distributor in Sydney.
Its business model is built around long-term concessions, with revenue linked to traffic volumes and, in many cases, inflation. This can create a growing income stream over time, which is particularly valuable for retirees.
As populations grow and cities expand, demand for toll road infrastructure is expected to remain strong.
Woolworths Group Ltd (ASX: WOW)
A third ASX share that could be a top addition to a retirement portfolio is Woolworths.
It is of course one of Australia's leading supermarket operators, providing essential goods to millions of customers every week. In fact, the company estimates that it serves 24 million customers each week across its growing network of businesses.
This gives it a very defensive earnings profile. Regardless of economic conditions, people still need to buy groceries.
The company also has a strong market position and a track record of paying dividends, making it a reliable option for income-focused investors.
Over time, its modest growth combined with steady dividends could help support a stable retirement income.