History
Riau, though part of Dutch and Indonesian territory, was economically under the influence of neighbouring Malaya. In order to affirm its fiscal stake in the region, a decree was passed on 15 October 1963 to replace the Malaya and British Borneo dollar (the circulating currency) with an Indonesian-issued currency, the Riau rupiah, which replaced the dollar at par. Although the Riau rupiah resembled the Indonesian rupiah in appearance, it had a much higher value. Malayan money was withdrawn from 1 November 1963. The Riau rupiah was exchangeable as a foreign currency with the Indonesian rupiah.
The Riau rupiah was much shorter lived than the West Irian rupiah (which circulated from May 1963 until 1971), and, by Presidential decree effective from 1 July 1964, the Riau rupiah was no longer a valid currency, being replaced by the Indonesian rupiah at a rate of 1 Riau rupiah = 14.7 Indonesian rupiah.
Banknotes
Bank Indonesia notes were printed by Indonesian printer Pertjetakan Kebajoran dated "1960" with the overprint 'Riau' in denominations of 5, 10 and 100 rupiah, all carrying the image of President Sukarno but with colour and other design differences. Lower denomination notes, under Indonesian (and previously Netherlands Indies) law were the issuing privilege of the Indonesian government, and for Riau bore the date "1961" with the overprint "Riau", in 1 and 2 ½ rupiah denominations.
Identical notes, but for the overprint, were used for the West Irian rupiah in 1964. The five notes issued in Riau, the 5, 10, and 100 rupiah notes, minus the "Riau" overprint, plus the 1 and 2½ rupiah note designs, redated "1964", were then also used as Indonesian rupiah notes in 1965.
Green (1) and blue (2½) variants of the 1 and 2½ notes had also incidentally been printed, intended for issue in North Borneo, which Indonesia saw as a possible extension to its territory due to the power vacuum in the region at that time.
| Notes of the 'Riau rupiah', 1960, Bank Indonesia, printed by Pertjetakan Kebajoran |
| Image | Value | Dimensions | Main Colour | Description | date of |
| Obverse | Reverse | Obverse | Reverse | Serial | Signature | Printer's mark | Watermark | Note | issue | withdrawal |
 |  | 5 rupiah | 134 × 67 mm | Violet | Sukarno with sugar cane, 'RIAU' overprint | Female Balinese dancer | 3 letters 6 numbers | Acting Governor: Soetikno Slamet; Director: Indra Kasoema | Pertjetakan Kebajoran | Sukarno | '1960' | 15 October 1963 | 30 June 1964 |
 |  | 10 rupiah | 140 × 70 mm | Pink | 2 female Balinese dancers |
 |  | 100 rupiah | 158 × 79 mm | Green | Batak male and female dancer |
| These images are to scale at 0.7 pixel per millimetre. For table standards, see the banknote specification table. |
| Notes of the 'Riau rupiah', 1961, Republik Indonesia, printed by Pertjetakan Kebajoran |
| Image | Value | Dimensions | Main Colour | Description | date of |
| Obverse | Reverse | Obverse | Reverse | Serial | Signature | Printer's mark | Watermark | Note | issue | withdrawal |
 |  | 1 rupiah | 122 × 61 mm | Red | Sukarno with sugar cane, 'RIAU' overprint | Balinese female dancer | 3 letters 6 numbers | R. M. Notohamiprodjo | no mark | no watermark | '1961' | 15 October 1963 | 30 June 1964 |
 |  | 2½ rupiah | 128 × 64 mm | Blue | Balinese female dancer |
| These images are to scale at 0.7 pixel per millimetre. For table standards, see the banknote specification table. |
| Notes of the 'Borneo rupiah', 1961, Republik Indonesia, printed by Pertjetakan Kebajoran |
| Image | Value | Dimensions | Main Colour | Description | date of |
| Obverse | Reverse | Obverse | Reverse | Serial | Signature | Printer's mark | Watermark | Note | issue | withdrawal |
 |  | 1 rupiah | 122 × 61 mm | Green | Sukarno with sugar cane | Balinese female dancer | 3 letters 6 numbers | R. M. Notohamiprodjo | no mark | no watermark | '1961' | | |
 |  | 2½ rupiah | 128 × 64 mm | Blue | Balinese female dancer |
| These images are to scale at 0.7 pixel per millimetre. For table standards, see the banknote specification table. |
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