The Australian share market has finished marginally higher, in its seventh straight day of gains, ahead of a meeting by the US Federal Reserve Open Markets Committee (FOMC).

The S&P/ASX200 benchmark index closed on Wednesday up 3.5 points, or 0.06 per cent, at 6,148.4 points, while the All Ordinaries index gained 6.4 points, or 0.1 per cent, at 6,269.3.

The Australian dollar was buying 69.88 US cents, up from 69.37 US cents at the close of trade on Tuesday